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52 results on '"Domaracka, A."'

1. Radiolysis of pyridine in solid water

Author: Philippe Boduch, Alicja Domaracka, Prudence C. J. Ada Bibang, Hermann Rothard, Aditya N. Agnihotri, Zuzana Kanuchova, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Astronomical Institute of the Slovak Academy of Sciences, Slovak Academy of Science [Bratislava] (SAS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)
Subjects: Materials science, Infrared spectroscopy, 010402 general chemistry, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, chemistry.chemical_compound, chemistry, 13. Climate action, Phase (matter), 0103 physical sciences, Pyridine, Radiolysis, Water environment, Physical chemistry, Molecule, Irradiation, Spectroscopy, 010303 astronomy & astrophysics, [CHIM.RADIO]Chemical Sciences/Radiochemistry
Abstract: We irradiated the complex organic molecule pyridine and mixtures of pyridine and water in the solid phase (thin icy films) at 12 K at different beam lines of the GANIL facility (ARIBE: 90 keV $$\hbox {O}^{\mathrm {6+}}$$ , SME: $$650\, \hbox {MeV Zn}^{\mathrm {26+}})$$ . The destruction of the initial molecule and the appearance of radiolytic products were followed by in-situ infrared absorption spectroscopy as a function of the projectile fluence with the CASIMIR experimental set-up of CIMAP. We measured the destruction cross section as a function of pyridine concentration. A clear dependence on the percentage of pyridine in $$\hbox {H}_{\mathrm {2}}\hbox {O}$$ was found: the destruction cross sections are significantly higher for small concentration, i.e. pure pyridine is more radioresistant than pyridine diluted in water ice at 12 K. Thus, the presence of water environment significantly modifies the radiation resistance of the initial complex organic molecules: it enhances radiosensitivity and destruction of pyridine, with implications for radiobiology and astrochemistry.
Published: 2021

2. Timing of charge migration in betaine by impact of fast atomic ions

Author: Dariusz G. Piekarski, Fernando Martín, Bernd A. Huber, Sergio Díaz-Tendero, Jesús González-Vázquez, Alicja Domaracka, Janina Kopyra, Lamri Adoui, Manuel Alcamí, Patrick Rousseau, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU), Atomes, Molécules et Agrégats (AMA), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Universidad Autónoma de Madrid (UAM), Siedlce University of Natural Sciences and Humanities, Centre National de la Recherche Scientifique (CNRS), UAM. Departamento de Química, Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Universidad Autonoma de Madrid (UAM)
Subjects: Materials science, Electron dynamics, Electron, 01 natural sciences, Electron Migration, Ion, Electron Dynamics, chemistry.chemical_compound, Betaine, Migration Time, 0103 physical sciences, Molecule, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Atomic Ion, [PHYS]Physics [physics], Multidisciplinary, 010304 chemical physics, Charge (physics), Química, Ion bombardment, Negative Charge, Ions Bombardment, Zwitter Ionic Molecule, chemistry, Chemical physics, Charge Migration, Astrophysics::Earth and Planetary Astrophysics, Splittings
Abstract: The way molecules break after ion bombardment is intimately related to the early electron dynamics generated in the system, in particular, charge (or electron) migration. We exploit the natural positive-negative charge splitting in the zwitterionic molecule betaine to selectively induce double electron removal from its negatively charged side by impact of fast O
Published: 2021

3. Non-thermal desorption of complex organic molecules

Author: Alicja Domaracka, Emmanuel Dartois, Philippe Boduch, A. Bacmann, Marin Chabot, Hermann Rothard, Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), This work was supported by the Programme National 'Physique et Chimie du Milieu Interstellaire' (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES., P2IO LabEx program: 'Evolution de la matière du milieu interstellaire aux exoplanètes avec le JWST', ANR-13-BS05-0004,IGLIAS,Irradiation de GLaces d'Intérêt AStrophysique(2013), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France, Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Thermal desorption, Analytical chemistry, FOS: Physical sciences, Infrared spectroscopy, Astrophysics, 01 natural sciences, Physics::Geophysics, chemistry.chemical_compound, cosmic rays, Sputtering, Phase (matter), 0103 physical sciences, solid state: volatile, Isotopologue, Physics::Chemical Physics, 010303 astronomy & astrophysics, Physics::Atmospheric and Oceanic Physics, Astrophysics::Galaxy Astrophysics, Physics, astrochemistry, Interstellar ice, 010401 analytical chemistry, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, ISM: molecules, 0104 chemical sciences, 3. Good health, ISM: lines and bands, molecular processes, chemistry, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Carbon dioxide, Methanol, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: Methanol ice is embedded in interstellar ice mantles present in dense molecular clouds. We aim to measure the sputtering efficiencies starting from different ice mantles of varying compositions experimentally, in order to evaluate their potential impact on astrochemical models. The sputtering yields of complex organic molecules is of particular interest, since few mechanisms are efficient enough to induce a significant feedback to the gas phase. We irradiated methanol and carbon dioxide ice mixtures of varying ratios with swift heavy ions in the electronic sputtering regime. We monitored the evolution of the infrared spectra and the species released to the gas phase with a mass spectrometer. Methanol and 13C-methanol isotopologue were used to remove any ambiguity on the measured irradiation products. The sputtering of methanol embedded in carbon dioxide ice is an efficient process leading to the ejection of intact methanol in the gas phase. We establish that when methanol is embedded in a carbon-dioxide-rich mantle exposed to cosmic rays, a significant fraction is sputtered as intact molecules. The sputtered fraction follows the time-dependent bulk composition of the ice mantle, the latter evolving with time due to the radiolysis-induced evolution of the bulk. If methanol is embedded in a carbon dioxide ice matrix, as the analyses of the spectral shape of the CO2 bending mode observations in some lines of sight suggest, the overall methanol sputtering yield is higher than if embedded in a water ice mantle. The sputtering is increased by a factor close to the dominant ice matrix sputtering yield, which is about six times higher for pure carbon dioxide ice when compared to water ice. These experiments are further constraining the cosmic-ray-induced ice mantle sputtering mechanisms important role in the gas-phase release of complex organic molecules from the interstellar solid phase., arXiv admin note: text overlap with arXiv:1906.03084
Published: 2020

4. Adamantane dication fragmentation dynamics following ion collisions

Author: Sergio Díaz-Tendero, P. Rousseau, S. Maclot, B A Huber, C. Nicolafrancesco, S. Indrajith, A. Domaracka, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des collisions atomiques et moléculaires (LCAM), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS]Physics [physics], History, chemistry.chemical_compound, Fragmentation (mass spectrometry), Chemistry, Adamantane, Photochemistry, Computer Science Applications, Education, Dication, Ion
Abstract: International audience
Published: 2020

5. Proton transfer from pinene stabilizes water clusters

Author: Jaroslav Kočišek, Jan Poštulka, Petr Slavíček, Andriy Pysanenko, Michal Fárník, Alicja Domaracka, Department of Physical Chemistry, University of Chemistry and Technology, Prague, J. Heyrovský Institute of Physical Chemistry of ASCR, v.v.i, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Pinene, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Solvation, General Physics and Astronomy, Protonation, 02 engineering and technology, Photoionization, 010402 general chemistry, 021001 nanoscience & nanotechnology, Mass spectrometry, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, chemistry, 13. Climate action, Chemical physics, Ionization, Physics::Atomic and Molecular Clusters, Water cluster, Physical and Theoretical Chemistry, Nuclear Experiment, 0210 nano-technology, Electron ionization, ComputingMilieux_MISCELLANEOUS
Abstract: We ionize small mixed pinene–water clusters by electron impact or by using photons after sodium doping and analyze the products by mass spectrometry. Electron ionization results in the formation of pure pinene, mixed pinene–water and protonated water cluster cations. The “fragmentation free” photoionization after sodium doping results into the formation of only water–Na+ clusters with a mean cluster size below that observed after electron ionization. We show that protonated water clusters are formed both directly and indirectly via pinene ionziation. The latter pathway is detailed by ab intio calculations, demonstrating the feasibility of proton transfer from pinene for larger water clusters. In small clusters, the proton transfer reaction is controlled by proton solvation energy and we can thus estimate its value for finite size clusters. The observed stabilization mechanism of water clusters may contribute to the formation of cloud condensation nuclei in the atmosphere.
Published: 2019

6. Decomposition of Iron Pentacarbonyl Induced by Singly and Multiply Charged Ions and Implications for Focused Ion Beam-Induced Deposition

Author: Chiara Nicolafrancesco, Alicja Domaracka, Kateryna Grygoryeva, Patrick Rousseau, Barbora Sedmidubská, Suvasthika Indrajith, Bernd A. Huber, Juraj Fedor, Pamir Nag, Jaroslav Kočišek, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Projectile, Astrophysics::High Energy Astrophysical Phenomena, 02 engineering and technology, Substrate (electronics), 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Focused ion beam, Decomposition, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Ion, Iron pentacarbonyl, chemistry.chemical_compound, General Energy, Nanolithography, chemistry, Physics::Plasma Physics, Chemical physics, Deposition (phase transition), Physical and Theoretical Chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 0210 nano-technology
Abstract: International audience; Focused ion beams are becoming important tools in nanofabrication.The underlying physical processes in the substrate were already explored for severalprojectile ions. However, studies of ion interaction with precursor molecules forbeam-assisted deposition are almost nonexistent. Here, we explore the interaction ofvarious projectile ions with iron pentacarbonyl. We report fragmentation patterns ofisolated gas-phase iron pentacarbonyl after interaction with 4He+ at a collisionenergy of 16 keV, 4He2+ at 16 keV, 20Ne+ at 6 keV, 20Ne4+ at 40 keV, 40Ar+ at 3 keV,40Ar3+ at 21 keV, 84Kr3+ at 12 keV, and 84Kr17+ at 255 keV. These projectiles coverinteraction regimes ranging from collisions dominated by nuclear stopping throughcollisions dominated by electronic stopping to soft resonant electron-captureinteractions. We report a surprising efficiency of Ne+ in the Fe(CO)5decomposition. The interaction with multiply charged ions results in a highercontent of parent ions and slow metastable fragmentation due to the electroncaptureprocess. The release of CO groups during the decomposition process seems to take off a significant amount of energy.The fragmentation mechanism may be described as Fe being trapped within a CO cluster.
Published: 2019

7. Understanding the formation of metastable furan dication in collisions with ions

Author: Manuel Alcamí, Sergio Díaz-Tendero, Suvasthika Indrajith, Néstor F. Aguirre, Ewa Erdmann, Paola Bolognesi, Jacopo Chiarinelli, Patrick Rousseau, Lorenzo Avaldi, Marta Łabuda, Alicja Domaracka, and Bernd A. Huber
Subjects: History, chemistry.chemical_compound, chemistry, Furan, Metastability, Photochemistry, Computer Science Applications, Education, Dication, Ion
Abstract: Synopsis This work relies on complementary theoretical and experimental studies of the processes induced by ion-furan collisions. Results of the Molecular Dynamics simulations and exploration of the energy profiles combined with coincidence mass spectrometry provide complete picture of the fragmentation of furan dication.
Published: 2020

8. Ion-collision induced molecular growth in polycyclic aromatic hydrocarbon clusters: comparison of C16H10 structural isomers

Author: Arkadiusz Mika, Patrick Rousseau, Alicja Domaracka, R. Delaunay, Bernd A. Huber, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU), Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Fluoranthene, chemistry.chemical_classification, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Optical physics, Polycyclic aromatic hydrocarbon, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Ion, chemistry.chemical_compound, chemistry, Structural isomer, Cluster (physics), Pyrene, Molecule, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract: The interaction of 3 keV Ar+ ions with clusters of two structural isomers of C16H10 polycyclic aromatic hydrocarbons, namely fluoranthene and pyrene, has been studied. Following the collision with the atomic projectile, a rich molecular growth inside of the cluster is observed for both isomers. The observed growth processes include the hydrogenation of the parent molecule and the addition of CHx units. They are more important in the case of collisions with fluoranthene clusters, this can be explained by a more flexible carbon skeleton and lower reaction barriers. Moreover, the evolution of the hydrogenation with the size of the growth products gives information on the growth mechanisms.
Published: 2018

9. Ion collision-induced chemistry in pure and mixed loosely bound clusters of coronene and C 60 molecules

Author: Henning Zettergren, Henrik Cederquist, Alicja Domaracka, Michael Gatchell, R. Delaunay, Bernd A. Huber, Patrick Rousseau, Arkadiusz Mika, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU), Centre National de la Recherche Scientifique (CNRS), Department of Physics [Stockholm], Stockholm University, Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Chemistry, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], General Physics and Astronomy, Mass spectrometry, 01 natural sciences, Coronene, Ion, chemistry.chemical_compound, Fragmentation (mass spectrometry), Covalent bond, Chemical physics, Ionization, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Cluster (physics), Molecule, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Physical and Theoretical Chemistry, Nuclear Experiment, 010306 general physics, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS
Abstract: Ionization, fragmentation and molecular growth have been studied in collisions of 22.5 keV He2+- or 3 keV Ar+-projectiles with pure loosely bound clusters of coronene (C24H12) molecules or with loosely bound mixed C60-C24H12 clusters by using mass spectrometry. The heavier and slower Ar+ projectiles induce prompt knockout-fragmentation - C- and/or H-losses - from individual molecules and highly efficient secondary molecular growth reactions before the clusters disintegrate on picosecond timescales. The lighter and faster He2+ projectiles have a higher charge and the main reactions are then ionization by ions that are not penetrating the clusters. This leads mostly to cluster fragmentation without molecular growth. However, here penetrating collisions may also lead to molecular growth but to a much smaller extent than with 3 keV Ar+. Here we present fragmentation and molecular growth mass distributions with 1 mass unit resolution, which reveals that the same numbers of C- and H-atoms often participate in the formation and breaking of covalent bonds inside the clusters. We find that masses close to those with integer numbers of intact coronene molecules, or with integer numbers of both intact coronene and C60 molecules, are formed where often one or several H-atoms are missing or have been added on. We also find that super-hydrogenated coronene is formed inside the clusters.
Published: 2018

10. Unusual hydroxyl migration in the fragmentation of β-alanine dication in the gas phase

Author: Patrick Rousseau, Manuel Alcamí, Sylvain Maclot, Dariusz G. Piekarski, Sergio Díaz-Tendero, Alicja Domaracka, Lamri Adoui, R. Delaunay, Fernando Martín, Bernd A. Huber, Departamento de Qímica, Módulo 13, Universidad Autónoma de Madrid, Departamento de Qímica, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: General Physics and Astronomy, Collisions of ions and atomic/molecular targets, Molecular Dynamics Simulation, 010402 general chemistry, 01 natural sciences, Dissociation (chemistry), Ion, Molecular dynamics, chemistry.chemical_compound, Fragmentation (mass spectrometry), Fragmentation, Computational chemistry, Cations, Hydroxides, Molecule, Hydroxymethyl, Physics::Chemical Physics, Physical and Theoretical Chemistry, Biomolecules, 010405 organic chemistry, Chemistry, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Coulomb explosion, Química, B-alanine, 0104 chemical sciences, Dication, Amino Acid, Gas, beta-Alanine, Gases, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Abstract: We present a combined experimental and theoretical study of the fragmentation of doubly positively charged b-alanine molecules in the gas phase. The dissociation of the produced dicationic molecules, induced by low-energy ion collisions, is analysed by coincidence mass spectrometric techniques; the coupling with ab initio molecular dynamics simulations allows rationalisation of the experimental observations. The present strategy gives deeper insights into the chemical mechanisms of multiply charged amino acids in the gas phase. In the case of the b-alanine dication, in addition to the expected Coulomb explosion and hydrogen migration processes, we have found evidence of hydroxyl-group migration, which leads to unusual fragmentation products, such as hydroxymethyl cation, and is necessary to explain some of the observed dominant channels, Financial support received from the CNRS PICS-05356 program, the ANR Programme Blanc PIBALE/ANR-09-BLAN-013001. Work was partially supported by the projects FIS2013-42002-R and CTQ2013-43698-P (MINECO), and NANOFRONTMAG (CAM). D.G.P. acknowledges the support of the Erasmus Mundus program of the European Union (FPA 2010-0147)
Published: 2015

11. Sputtering of sodium and potassium from nepheline: Secondary ion yields and velocity spectra

Author: C.R. Ponciano, Hussein Hijazi, Philippe Boduch, R. Martinez, A. N. Agnihotri, T. Langlinay, F. Ropars, Amine Cassimi, E. F. da Silveira, John Robert Brucato, Giovanni Strazzulla, Hermann Rothard, Maria Elisabetta Palumbo, Alicja Domaracka, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Pontifical Catholic University of Rio de Janeiro (PUC), INAF - Osservatorio Astrofisico di Catania (OACT), Istituto Nazionale di Astrofisica (INAF), INAF - Osservatorio Astrofisico di Arcetri (OAA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), ITA, FRA, and BRA
Subjects: Nuclear and High Energy Physics, 010504 meteorology & atmospheric sciences, Physics::Instrumentation and Detectors, Cosmic ray, 7. Clean energy, 01 natural sciences, Fluence, Ion, chemistry.chemical_compound, Sputtering, Nepheline, 0103 physical sciences, Irradiation, 010303 astronomy & astrophysics, Instrumentation, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, [PHYS]Physics [physics], Highly charged ion, chemistry, 13. Climate action, Physics::Space Physics, Astrophysics::Earth and Planetary Astrophysics, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Exosphere
Abstract: Silicates are the dominant surface material of many Solar System objects, which are exposed to ion bombardment by solar wind ions and cosmic rays. Induced physico-chemical processes include sputtering which can contribute to the formation of an exosphere. We have measured sputtering yields and velocity spectra of secondary ions ejected from nepheline, an aluminosilicate thought to be a good analogue for Mercury's surface, as a laboratory approach to understand the evolution of silicate surfaces and the presence of Na and K vapor in the exosphere. Experiments were performed with highly charged ion beams (keV/u–MeV/u) delivered by GANIL using an imaging XY-TOF-SIMS device under UHV conditions. The fluence dependence of sputtering yields gives information about the evolution of surface stoichiometry during irradiation. From the energy distributions N(E) of sputtered particles, the fraction of particles which could escape from the gravitational field of Mercury, and of those falling back and possibly contributing to populate the exosphere can be roughly estimated.
Published: 2017

12. Fragmentation of pure and hydrated clusters of 5Br-uracil by low energy carbon ions: observation of hydrated fragments

Author: Alicja Domaracka, Sylvain Maclot, Jaroslav Kočišek, Patrick Rousseau, Paola Bolognesi, R. Delaunay, Mattea Carmen Castrovilli, Bernd A. Huber, Lorenzo Avaldi, P. Markush, Antonella Cartoni, Istituto di Struttura della Materia (CNR-ISM), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU), Department of Chemistry University 'La Sapienza', Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Centre National de la Recherche Scientifique (CNRS), J. Heyrovsky Institute of Physical Chemistry (JH-INST), Czech Academy of Sciences [Prague] (CAS), Consiglio Nazionale delle Ricerche [Roma] (CNR), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome]
Subjects: collision-induced dissociation, gas-phase, halogenated pyrimidine, malignant glioma, Strong interaction, General Physics and Astronomy, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Ion, chemistry.chemical_compound, Low energy, Fragmentation (mass spectrometry), Cluster (physics), Molecule, Physical and Theoretical Chemistry, ComputingMilieux_MISCELLANEOUS, Chemistry, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Uracil, 021001 nanoscience & nanotechnology, COLLISION-INDUCED DISSOCIATION, GAS-PHASE, HALOGENATED PYRIMIDINE, RADIATION-THERAPY, AUGER PROCESSES, X-RAYS, 5-BROMOURACIL, URACIL, 0104 chemical sciences, Crystallography, 13. Climate action, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], 0210 nano-technology
Abstract: [object Object]The fragmentation of the isolated 5-bromouracil (5BrU) molecule and pure and nano-hydrated 5BrU clusters induced by low energy C-12(4+) ions has been studied. A comparison indicates that the environment, on the one hand, protects the system against the complete break-up into small fragments, but, on the other hand, triggers 'new' pathways for fragmentation, for example the loss of the OH group. The most striking result is the observation of several series of hydrated fragments in the hydrated cluster case, with water molecules bound to hydrophilic sites of 5BrU. This highlights the strong interaction between 5BrU and water molecules and the blocking of specific fragmentation pathways, such as the loss of the BrC2H group for example.
Published: 2017

13. Implantation of multiply charged sulfur ions in water ice

Author: S. Guillous, J. J. Ding, Alicja Domaracka, Giovanni Strazzulla, Hermann Rothard, Maria Elisabetta Palumbo, X. Y. Lv, Philippe Boduch, T. Langlinay, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astrofisico di Catania (OACT), Istituto Nazionale di Astrofisica (INAF), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Range (particle radiation), Materials science, 010504 meteorology & atmospheric sciences, Ion beam, Analytical chemistry, chemistry.chemical_element, Astronomy and Astrophysics, Sulfuric acid, 01 natural sciences, 7. Clean energy, Sulfur, Ion, chemistry.chemical_compound, Ion implantation, chemistry, 13. Climate action, Space and Planetary Science, 0103 physical sciences, Irradiation, Atomic physics, Fourier transform infrared spectroscopy, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract: Sulfuric acid has been suggested to be present on the surface of the jovian moon Europa where it is mixed with the dominant water ice. The formation mechanism of sulfuric acid is still under discussion. We present new experimental results on the implantation of S q + ( q = 7, 9, 11) ions at an energy range between 35 and 176 keV in water ice at 80 K. Previous results on 200 keV S + implantation in H 2 O at 80 K have also been included in the data analysis. Experiments with multiply-charged ions at different energies are particularly relevant to simulate the complexity of the irradiation environment to which the surface of Europa is exposed being embedded in the jovian magnetosphere. The experiments were performed at the low energy ion beam facility ARIBE of GANIL in Caen (France). 35–176 keV S q + ( q = 7, 9, 11) ions were implanted in solid H 2 O layers which were frozen at 80 K. Fourier Transform Infrared Spectrometry (FTIR) was used to analyze the sample in the 5000–600 cm −1 (2–16.7 μm) region with a spectral resolution of 1 cm −1 . The results of our experiments indicate that implantation produces hydrated sulfuric acid with yields that increase with ion energy, from 0.12 molecules ion −1 for 35 keV ions to 0.64 molecules ion −1 for 200 keV ions. We have also searched for the production of SO 2 and H 2 S, but we were not able to find any evidence for their synthesis. We conclude that sulfur ion implantation is the dominant formation mechanism of hydrated sulfuric acid at Europa. The suggestion that the observed distribution of sulfuric acid on the surface is well correlated with the local flux of sulfur ions find a full explanation by present experimental data.
Published: 2013

14. Cosmic ray–ice interaction studied by radiolysis of 15 K methane ice with MeV O, Fe and Zn ions

Author: C. Mejía, Philippe Boduch, Alicja Domaracka, E. F. da Silveira, Hermann Rothard, Vinicius Bordalo, A. L. F. de Barros, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (Rio de Janeiro) ( CEFET/RJ), Pontifical Catholic University of Rio de Janeiro (PUC), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Astrochemistry, 010504 meteorology & atmospheric sciences, Infrared, Analytical chemistry, Cosmic ray, 7. Clean energy, 01 natural sciences, Methane, Ion, chemistry.chemical_compound, 0103 physical sciences, Spectroscopy, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astronomy and Astrophysics, Interstellar medium, chemistry, [SDU]Sciences of the Universe [physics], 13. Climate action, Space and Planetary Science, Radiolysis, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: Methane (CH4) ice is found in the interstellar medium and in several bodies of the Solar system, where it is commonly exposed to cosmic rays and stellar winds. The chemical, physical and structural effects induced by fast heavy ions in thin layers of pure CH4 ices at 15 K are analysed by mid-infrared spectroscopy (Fourier transform infrared). Different pure CH4 ice samples were irradiated with 6 MeV 16 O 2 + , 220 MeV 16 O 7 + , 267 MeV 56 Fe 22 + and 606 MeV 70 Zn 26 + ions at Grand Acc´´ National d’Ions Lourds/France. Results show that CnHm molecules, where n = 2–4 and m = 2(n − 1) to 2(n + 1) and radical species CH3 ,C 2H3 and C2H5 are formed. The destruction cross-sections of CH4 ice and the formation cross-sections of new molecules CnHm are reported. The extrapolation of current results allow us to estimate the half lives of CH4 ices in the interstellar medium and the Solar system (Earth orbit) as about 600 × 10 6 and 600 yr, respectively. This huge ratio strongly suggests that the vast majority of
Published: 2013

15. The irradiation of pure CH3OH and 1:1 mixture of NH3:CH3OH ices at 30K using low energy electrons

Author: Sylwia Ptasinska, Nigel J. Mason, Sohan Jheeta, Bhalamurugan Sivaraman, and Alicja Domaracka
Subjects: Formamide, Chemistry, Methyl formate, Formic acid, Inorganic chemistry, Formaldehyde, General Physics and Astronomy, Photochemistry, Isocyanic acid, Cyanate, chemistry.chemical_compound, Methanol, Physical and Theoretical Chemistry, Carbon monoxide
Abstract: The results of an experimental investigation of 1 keV electron irradiation of ices (deposited at 30 K) of (i) pure methanol and (ii) of a 1:1 mixture of NH3:CH3OH are reported. Molecular products formed within the ice were detected and monitored using FTIR spectroscopy. The products observed were methyl formate (H3COHCO), methane (CH4), hydroxymethyl (CH2OH), formamide (HCONH2), formic acid (HCOOH), formaldehyde (H2CO), formyl radical (HCO), cyanate ion (OCN−), isocyanic acid (HNCO), carbon monoxide (CO) and carbon dioxide (CO2). The consequences of these results for prebiotic chemistry in the interstellar medium and star forming regions are discussed.
Published: 2013

16. The role of the environment in the ion induced fragmentation of uracil

Author: Paola Bolognesi, Jaroslav Kočišek, R. Delaunay, Mattea Carmen Castrovilli, Sylvain Maclot, Bernd A. Huber, Patrick Rousseau, Pal Markush, Antonella Cartoni, Lorenzo Avaldi, Alicja Domaracka, CNR-ISM, Department of Chemistry University 'La Sapienza', Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: physics and astronomy (all), physical and theoretical chemistry, electron attachment, photodissociation, attachment DEA, General Physics and Astronomy, Collisions of ions and atomic/molecular targets, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Ion, chemistry.chemical_compound, Fragmentation (mass spectrometry), Computational chemistry, Molecule, uracil, Physical and Theoretical Chemistry, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Fragmentation dynamics, Uracil, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Biomolecular clusters, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], 0210 nano-technology
Abstract: International audience; The fragmentation of uracil molecules and pure and nano-hydrated uracil clusters by 12C4+ ion impact is investigated. This work focuses on the fragmentation behavior of complex systems and the effect of the environment. On the one hand, it is found that the environment in the form of surrounding uracil or water molecules has a significant influence on the fragmentation dynamics, providing an overall ‘protective’ effect, while on the other hand we observe the opening of specific fragmentation channels. In particular, we report on the first observation of a series of hydrated fragments. This indicates a strong interaction between uracil and water molecules, holding the water clusters bound to the observed molecular fragments.
Published: 2016

17. Formation of unsaturated hydrocarbons in interstellar ice analogues by cosmic rays

Author: Diana P. P. Andrade, Philippe Boduch, Hermann Rothard, E. F. da Silveira, Sergio Pilling, and Alicja Domaracka
Subjects: Physics, Astrochemistry, Cyclohexane, Interstellar ice, Cyclohexene, Astronomy and Astrophysics, Aromaticity, 010402 general chemistry, Mass spectrometry, 01 natural sciences, 0104 chemical sciences, Ion, chemistry.chemical_compound, chemistry, Space and Planetary Science, Hexene, 0103 physical sciences, Physical chemistry, 010303 astronomy & astrophysics
Abstract: The formation of C=C and C≡C bonds from the processing of pure c-C6H12 (cyclo- hexane) and mixed H2O:NH3:c-C6H12 (1:0.3:0.7) ices by highly-charged, and energetic ions (219 MeV 16 O 7+ and 632 MeV 58 Ni 24+ ) is studied. The experiments simulate the physical chemistry induced by medium-mass and heavy-ion cosmic rays in interstellar ices analogs. The measurements were performed inside a high vacuum chamber at the heavy-ion acceler- ator GANIL (Grand Accelerateur National d'Ions Lourds) i n Caen, France. The gas samples were deposited onto a polished CsI substrate previously cooled to 13 K. In-situ analysis was performed by a Fourier transform infrared (FTIR) spectrometry at different ion fluences. Dis- sociation cross section of cyclohexane and its half-life in astrophysical environments were determined. A comparison between spectra of bombarded ices and young stellar sources in- dicates that the initial composition of grains in theses env ironments should contain a mixture of H2O, NH3, CO (or CO2), simple alkanes, and CH3OH. Several species containing double or triple bounds were identified in the radiochemical produc ts, such as hexene, cyclohexene, benzene, OCN − , CO, CO2, as well as several aliphatic and aromatic alkenes and alkynes. The results suggest an alternative scenario for the product ion of unsaturated hydrocarbons and possibly aromatic rings (via dehydrogenation processes) in interstellar ices induced by cosmic ray bombardment.
Published: 2012

18. Low-energy ions interacting with anthracene molecules and clusters

Author: J. Y. Chesnel, Henning Zettergren, Alicja Domaracka, Lamri Adoui, Patrick Rousseau, Henrik Cederquist, Jimmy Rangama, Anne I. S. Holm, Stefan Rosén, A. Méry, Bruno Manil, E. Lattouf, Henning T. Schmidt, Bernd A. Huber, R. Maisonny, Sylvain Maclot, M. Capron, H. A. B. Johansson, A. Ławicki, F. Seitz, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Department of Physics [Stockholm], Stockholm University, Laboratoire de Physique des Lasers (LPL), Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS), AlbaNova University Center, Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)
Subjects: [PHYS]Physics [physics], Nuclear and High Energy Physics, Chemical ionization, Anthracene, Photochemistry, 01 natural sciences, 7. Clean energy, Molecular physics, Ion, chemistry.chemical_compound, Monomer, chemistry, Fragmentation (mass spectrometry), Ionization, 0103 physical sciences, Molecule, 010306 general physics, 010303 astronomy & astrophysics, Instrumentation, ComputingMilieux_MISCELLANEOUS, Electron ionization
Abstract: The interaction of slow ions ( v ∼ 0.4 a.u. ) with a small polycyclic aromatic hydrocarbon, namely anthracene (C 14 H 10 ), is studied in the gas-phase either with the isolated molecule or with a pure cluster target. We discuss the ionization and fragmentation of the molecule with respect to the projectile charge state, i.e. for singly charged He + ions and for multiply charged Xe 20+ ions. For the isolated C 14 H 10 , single or multiple ionization of the molecule occurs under ion impact. The (multi) cation relative yields are compared with those obtained by other ionization methods (electron and fs-laser). The molecular dissociation occurs by loss of hydrogen and small hydrocarbon molecules, leading to the formation of C n H x cations. The interaction of Xe 20+ with C 14 H 10 clusters gives surprising results, i.e. the emission of hotter monomer compared to the interaction with He + .
Published: 2012

19. Chemistry induced by low-energy electrons in condensed multilayers of pure small organic acids

Author: Isabel Martin, A. Lafosse, A. Domaracka, M. Bertin, Roger Azria, and Eugen Illenberger
Subjects: chemistry.chemical_classification, Range (particle radiation), Decarboxylation, Formic acid, Carboxylic acid, High resolution electron energy loss spectroscopy, Condensed Matter Physics, Photochemistry, Ion, chemistry.chemical_compound, chemistry, Trifluoroacetic acid, Irradiation, Physical and Theoretical Chemistry, Instrumentation, Spectroscopy
Abstract: Electron-induced decarboxylation in condensed films of formic acid HCOOH, partially deuterated acetic acid CH3COOD and trifluoroacetic acid CF3COOH, has been studied in the energy range 0.7–20 eV by high resolution electron energy loss spectroscopy (HREELS). The yield of carbon dioxide formation shows a peak around 1 eV irradiation energy associated with a resonant mechanism involving the transient negative ion [RCOOH] #− and an essentially non-resonant contribution increasing with irradiation energy above an onset located in the range 6–9 eV, depending on the carboxylic acid under consideration. The remarkable point of this study is that it is possible to selectively control the decarboxylation reaction by tuning the electron energy of irradiation.
Published: 2008

20. Slow ion interaction with N-methylglycine and N-acetylglycine

Author: Bernd A. Huber, Sergio Diaz Tendero, Jaroslav Kocisek, Dariusz Grzegorz Piekarskh, Alicja Domaracka, Fernando Martín, Lamri Adoui, Patrick Rousseau, Janina Kopyra, R. Delaunay, Manuel Alcamí, and UAM. Departamento de Química
Subjects: chemistry.chemical_classification, History, Ionization, Stereochemistry, Diol, Química, Molecules, Condensed matter physics, Tautomer, Computer Science Applications, Education, Amino acid, Ionization of gases, chemistry.chemical_compound, chemistry, Fragmentation (mass spectrometry), Glycine, Molecule, Peptide bond
Abstract: N-acetyl glycine and N-methyl glycine molecules in the gas phase are ionized by electron exchange with slow O6+ ions at an energy of 48 keV. After ionization, the methyl and acetyl substituted glycines dissociate into fragments analogous to that resulting from ionization and fragmentation of amino acids and peptides, respectively. N-acetylglycine which contains a peptide bond also effectively tautomerizes to the diol form. Such tautomerization is typical for amino acids, however, we show that the tautomerization mechanism of the N-acetylglycine is different.
Published: 2015

21. Molecular Growth Inside of Polycyclic Aromatic Hydrocarbon Clusters Induced by Ion Collisions

Author: Henrik Cederquist, Fernando Martín, Henning Zettergren, Mark H. Stockett, Sylvain Maclot, Bernd A. Huber, Tao Chen, Patrick Rousseau, Yang Wang, R. Delaunay, Alicja Domaracka, Michael Gatchell, Lamri Adoui, Manuel Alcamí, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Department of Physics [Stockholm], Stockholm University, Departamento de Qímica, Módulo 13, Universidad Autónoma de Madrid, Departamento de Qímica, Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Polycyclic aromatic hydrocarbon, Collisions of ions and atomic/molecular targets, 01 natural sciences, 7. Clean energy, Ion, Molecular dynamics, chemistry.chemical_compound, Saturn, 0103 physical sciences, Cluster (physics), Molecule, General Materials Science, Physical and Theoretical Chemistry, 010306 general physics, 010303 astronomy & astrophysics, Physics, chemistry.chemical_classification, Polycyclic Aromatic Hydrocarbons PAHs, Reactivity, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], chemistry, 13. Climate action, Chemical physics, Cluster, Yield (chemistry), Pyrene, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Atomic physics
Abstract: International audience; The present work combines experimental and theoretical studies of the collision between keV ion projectiles and clusters of pyrene, one of the simplest polycyclic aromatic hydrocarbons (PAHs). Intracluster growth processes induced by ion collisions lead to the formation of a wide range of new molecules with masses larger than that of the pyrene molecule. The efficiency of these processes is found to strongly depend on the mass and velocity of the incoming projectile. Classical molecular dynamics simulations of the entire collision process—from the ion impact (nuclear scattering) to the formation of new molecular species—reproduce the essential features of the measured molecular growth process and also yield estimates of the related absolute cross sections. More elaborate density functional tight binding calculations yield the same growth products as the classical simulations. The present results could be relevant to understand the physical chemistry of the PAH-rich upper atmosphere of Saturn’s moon Titan.
Published: 2015

22. Effects of the environment on the uracil molecule ionization induced by 12C4+ ion beam

Author: R. Delaunay, Patrick Rousseau, Sylvain Maclot, P. Markush, J Kocisek, Bernd A. Huber, P Bolognesi, Alicja Domaracka, L Avaldi, Antonella Cartoni, and Mattea Carmen Castrovilli
Subjects: Quantitative Biology::Biomolecules, History, Ion beam, Analytical chemistry, Uracil, Photochemistry, Mass spectrometry, physics and astronomy (all), electron attachment, photodissociation, attachment DEA, Quantitative Biology::Genomics, Computer Science Applications, Education, Ion, chemistry.chemical_compound, chemistry, Fragmentation (mass spectrometry), Ionization, Mass spectrum, Molecule, heterocyclic compounds, Photon - Molecule and Small Cluster, Nuclear Experiment
Abstract: In this study the fragmentation of isolated uracil molecules, uracil clusters and hydrated uracil clusters induced by 12 C 4+ ions at 36 keV energy has been investigated. The mass spectra obtained by a TOF mass spectrometer are analyzed and compared to each other in order to see how the environment affects the fragmentation dynamics. The main differences between the mass spectra are highlighted and possible fragmentation pathways are proposed.
Published: 2015

23. Diamond surface modification following thermal etching of Si supported hydrogenated diamond films by DBr

Author: M. Bertin, A. Domaracka, R. Azria, D. Pliszka, A. Lafosse, Laboratoire des collisions atomiques et moléculaires (LCAM), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Faculty of Applied Physics and Mathematics, Gdańsk University of Technology (GUT), and Geurts, Mireille
Subjects: Materials science, Silicon, Annealing (metallurgy), Material properties of diamond, chemistry.chemical_element, High resolution electron energy loss spectroscopy, 02 engineering and technology, Chemical vapor deposition, engineering.material, 01 natural sciences, chemistry.chemical_compound, [PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, Materials Chemistry, Silicon carbide, 010306 general physics, business.industry, Diamond, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, chemistry, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], engineering, Surface modification, Optoelectronics, 0210 nano-technology, business
Abstract: In this work, we study the modification of hydrogenated diamond films deposited on silicon resulting from its exposure to DBr followed by an annealing above 600 K, using high resolution electron energy loss spectroscopy (HREELS). This procedure results in silicon carbide SiC formation within the diamond film, as evidenced by the observation of a loss peak at 117 meV and its first harmonic at 233 meV in HREEL spectra. This diamond surface modification is interpreted as resulting from the reaction of products of the silicon support thermally activated etching with hydrogenated diamond.
Published: 2006

24. Cross sections for electron scattering from sulfuryl chloride fluoride (SO2ClF) molecules

Author: Alicja Domaracka, Elżbieta Ptasińska-Denga, Paweł Możejko, Stanisław Kwitnewski, and Czesław Szmytkowski
Subjects: Physics, Elastic scattering, Sulfuryl chloride fluoride, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, chemistry.chemical_compound, Cross section (physics), chemistry, Ionization, Atom, Molecule, Atomic physics, Electron scattering, Electron ionization
Abstract: Absolute total cross section (TCS) for electron scattering from sulfuryl chloride fluoride (SO2ClF) molecules was measured in a linear transmission experiment at energies ranging from 0.6 to 370 eV. The experimental TCS energy function has a deep minimum (30 × 10−20 m2) at 3 eV which separates two distinct TCS enhancements. Below 3 eV the TCS curve increases steeply towards lower energies with a small resonant maximum visible near 2.2 eV. Above 3 eV the TCS is dominated by second pronounced enhancement with the maximum (45 × 10−20 m2) peaked near 9.5 eV. The experimental TCS findings are—at intermediate energies—satisfactorily reproduced with our total cross section estimation based on calculations of integral elastic (in independent atom approximation) and ionization (binary-encounter-Bethe approach) cross sections. The TCS measured for SO2ClF is also compared with experimental TCSs for molecules containing sulfur as a central atom and it is found that some features observed for SO2ClF are shared by others of the compared molecules.
Published: 2005

25. Electron scattering by sulfur tetrafluoride (SF4) molecules

Author: Alicja Domaracka, Stanisław Kwitnewski, Paweł Możejko, Elżbieta Ptasińska-Denga, and Czesław Szmytkowski
Subjects: Elastic scattering, Physics, Cross section (physics), chemistry.chemical_compound, chemistry, Ionization, Molecule, Sulfur tetrafluoride, Atomic physics, Condensed Matter Physics, Electron scattering, Atomic and Molecular Physics, and Optics, Electron ionization
Abstract: Absolute total cross section (TCS) for electron scattering from sulfur tetrafluoride (SF4) molecules was measured in a linear transmission experiment at energies ranging from low (0.1 eV) to intermediate (370 eV). Below 1.6 eV the TCS function increases steeply towards lower energies and shows small resonant-like maximum near 0.4 eV. Two other distinct enhancements are located at higher energies: a narrow one is peaked at 12 eV, and a very broad hump is centred near 40 eV. Our experimental TCS results are compared with the previous TCS measurements at low impact energies and at intermediate energies—with our total cross section estimations based on calculations of elastic and ionization cross sections. The TCS for SF4 is also compared with SFn (n = 1, 2, 6) total cross sections.
Published: 2005

26. Electron collisions with trifluorides: BF3 and PF3 molecules

Author: Michal Piotrowicz, Alicja Domaracka, Czesław Szmytkowski, Elżbieta Ptasińska-Denga, Łukasz Kłosowski, and Grzegorz Kasperski
Subjects: chemistry.chemical_compound, chemistry, Intermediate energy, Transmission method, General Physics and Astronomy, Molecule, Phosphorus trifluoride, Peak value, Electron, Physical and Theoretical Chemistry, Atomic physics, Electron scattering, Boron trifluoride
Abstract: Absolute total cross sections (TCSs) for electron scattering from boron trifluoride (BF(3)) and phosphorus trifluoride (PF(3)) molecules have been measured using a linear transmission method. The electron energy ranges from 0.6 to 370 eV for BF(3) and from 0.5 to 370 eV for PF(3). The TCS energy dependence for BF(3) exhibits two very pronounced enhancements: resonantlike narrow feature located near 3.6 eV with the maximum value of 19.2 x 10(-20) m(2), and intermediate energy very broad enhancement with two humps, one centered around 21 eV (18.8 x 10(-20) m(2) in the maximum) and the other near 45 eV (19.5 x 10(-20) m(2)). For PF(3) the TCS has quite different low-energy dependence: at 0.5 eV it has a high value of 70 x 10(-20) m(2) and decreases steeply towards higher energies. Beyond the minimum near 5.5 eV, the TCS reveals two distinct humps: the resonant one centered near 11 eV with the peak value of 32.9 x 10(-20) m(2) and the second one much broader around 35 eV (27.9 x 10(-20) m(2)). The present TCSs for trifluorides are compared to each other as well as to previous TCS data for selected perfluorides and to results for their perhydrided counterparts. The differences and similarities in the shape and magnitude of TCSs are pointed out.
Published: 2004

27. Scattering of electrons from hydride molecules: PH3

Author: Alicja Domaracka, Lukasz Kłosowski, Michal Piotrowicz, Elżbieta Ptasińska-Denga, and Czesław Szmytkowski
Subjects: Physics, chemistry.chemical_compound, Cross section (physics), chemistry, Hydride, Scattering, Molecule, Electron, Atomic physics, Condensed Matter Physics, Electron scattering, Atomic and Molecular Physics, and Optics, Phosphine
Abstract: An absolute total cross section (TCS) for electron scattering from phosphine (PH3) molecules was obtained in a linear transmission experiment at energies ranging from low (0.5 eV) to intermediate (370 eV). The dominant behaviour of the TCS energy function is a very pronounced low-energy enhancement with two distinct resonant-like humps peaked at around 2.4 and 6 eV. Above 10 eV the TCS is a rather featureless, monotonically decreasing function of energy. Our experimental results are compared with the theoretical predictions and intermediate-energy measurements. The similarities and differences of experimental TCS data for isoelectronic hydrides containing third-period atoms (SiH4, PH3, H2S and HCl) are also pointed out and discussed.
Published: 2004

28. Total cross section for low-energy electron scattering from formic acid, (HCOOH), molecules

Author: Mateusz Zawadzki, Czesław Szmytkowski, Elżbieta Ptasińska-Denga, Paweł Możejko, and Alicja Domaracka
Subjects: History, Electron spectrometer, Materials science, Formic acid, Resonant scattering, Molecular physics, Computer Science Applications, Education, chemistry.chemical_compound, Cross section (physics), Low energy, chemistry, Transmission (telecommunications), Computer Science::Systems and Control, Molecule, Electron scattering
Abstract: Total cross section (TCS) for low-energy electron scattering from formic acid molecules has been measured using electrostatic electron spectrometer working in linear transmission mode. Two local maxima centered around 1.7 eV and 7.8 eV have been observed and associated with resonant scattering processes.
Published: 2017

29. Cross sections calculations for electron scattering from dimethylamine, NH(CH3)2, molecule

Author: Paweł Możejko, Alicja Domaracka, and Bożena Żywicka
Subjects: History, chemistry.chemical_compound, Chemistry, Molecule, Photochemistry, Electron scattering, Dimethylamine, Computer Science Applications, Education
Published: 2017

30. Ions colliding with mixed clusters ofC60and coronene: Fragmentation and bond formation

Author: Henning Zettergren, Henrik Cederquist, Mark H. Stockett, Bernd A. Huber, A. Méry, Sylvain Maclot, Michael Gatchell, Jean-Yves Chesnel, Tao Chen, Alicja Domaracka, Lamri Adoui, Patrick Rousseau, Henning T. Schmidt, Department of Physics [Stockholm], Stockholm University, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS]Physics [physics], Physics, Fullerene, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Molecular physics, Atomic and Molecular Physics, and Optics, Coronene, Ion, chemistry.chemical_compound, chemistry, Fragmentation (mass spectrometry), Covalent bond, Ionization, Physics::Atomic and Molecular Clusters, Cluster (physics), Molecule, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Atomic physics, Nuclear Experiment
Abstract: International audience; We have studied collisions between 22.5 keV He2+ ions and mixed clusters [(C60)m(C24H12)n] of m C60 and n coronene molecules where m and n range up to about ten. Surprisingly, the cluster fragmentation behavior in distant collisions is dramatically different for pure coronene clusters (m=0) and clusters containing a single C60 molecule (m=1). In the latter case, the clusters may be ionized without also being fragmented on the experimental time scale of tens of microseconds. This does not occur for pure coronene clusters, but is a main characteristic of pure fullerene clusters. For ion trajectories penetrating the mixed cluster, we observe covalent bond formations between C59 or C58 and C60, but not between coronene fragments and C60, or between C60 fragments and coronene. These results are explained by means of classical molecular dynamics simulations of collisions inside the fragmenting mixed clusters.
Published: 2014

31. Absolute fragmentation cross sections in atom-molecule collisions

Author: Ye Zhang, Michael Gatchell, Sylvain Maclot, John D. Alexander, Alicja Domaracka, Henrik Cederquist, Patrick Rousseau, Henning Zettergren, Mark H. Stockett, Bernd A. Huber, Lamri Adoui, Thomas Schlathölter, Tao Chen, Henning T. Schmidt, R. Delaunay, Quantum interactions and structural dynamics, Department of Physics [Stockholm], Stockholm University, Faculty of Physics [MSU, Moscow], Lomonosov Moscow State University (MSU), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), KVI Atomic and Molecular Physics (KVI), University of Groningen [Groningen], Zernike Institute for Advanced Materials, Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: chemistry.chemical_classification, INFRARED-SPECTRA, IONS, Anthracene, FULLERENES, Hydrogen bond, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], General Physics and Astronomy, Polycyclic aromatic hydrocarbon, Molecular physics, ANTHRACENE, Dissociation (chemistry), Ion, THERMOCHEMISTRY, chemistry.chemical_compound, chemistry, Fragmentation (mass spectrometry), GAS, DENSITY, Atom, Molecule, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Physical and Theoretical Chemistry, Atomic physics, C-60
Abstract: International audience; We present scaling laws for absolute cross sections for non-statistical fragmentation in collisions between Polycyclic Aromatic Hydrocarbons (PAH/PAH(+)) and hydrogen or helium atoms with kinetic energies ranging from 50 eV to 10 keV. Further, we calculate the total fragmentation cross sections (including statistical fragmentation) for 110 eV PAH/PAH(+) + He collisions, and show that they compare well with experimental results. We demonstrate that non-statistical fragmentation becomes dominant for large PAHs and that it yields highly reactive fragments forming strong covalent bonds with atoms (H and N) and molecules (C6H5). Thus nonstatistical fragmentation may be an effective initial step in the formation of, e. g., Polycyclic Aromatic Nitrogen Heterocycles (PANHs). This relates to recent discussions on the evolution of PAHNs in space and the reactivities of defect graphene structures.
Published: 2014

32. Comparison of UV and high-energy ion irradiation of methanol:ammonia ice

Author: Alicja Domaracka, Emmanuel Dartois, A. Jiménez-Escobar, Philippe Boduch, Hermann Rothard, G. M. Muñoz Caro, Centro de Astrobiologia [Madrid] (CAB), Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), European Project: 227012,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2008-1,SPIRIT(2009), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)
Subjects: Astrochemistry, Physics::Medical Physics, Analytical chemistry, FOS: Physical sciences, methods: laboratory: molecular, Cosmic ray, Astrophysics, 7. Clean energy, ultraviolet: ISM, law.invention, Ion, chemistry.chemical_compound, Ammonia, cosmic rays, law, Molecule, Irradiation, Solar and Stellar Astrophysics (astro-ph.SR), Earth and Planetary Astrophysics (astro-ph.EP), Physics, Gas-discharge lamp, astrochemistry, extinction, Astronomy and Astrophysics, chemistry, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, Methanol, dust, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], techniques: spectroscopic, Astrophysics - Earth and Planetary Astrophysics
Abstract: The main goal of this work is to compare the effects induced in ices of astrophysical relevance by high-energy ions, simulating cosmic rays, and by vacuum ultraviolet (UV) photons. This comparison relies on in situ infrared spectroscopy of irradiated CH3OH:NH3 ice. Swift heavy ions were provided by the GANIL accelerator. The source of UV was a microwave-stimulated hydrogen flow discharge lamp. The deposited energy doses were similar for ion beams and UV photons to allow a direct comparison. A variety of organic species was detected during irradiation and later during ice warm-up. These products are common to ion and UV irradiation for doses up to a few tens of eV per molecule. Only the relative abundance of the CO product, after ice irradiation, was clearly higher in the ion irradiation experiments. For some ice mixture compositions, the irradiation products formed depend only weakly on the type of irradiation, swift heavy ions, or UV photons. This simplifies the chemical modeling of energetic ice processing in space., 9 pages, 9 figures, 2 tables, accepted in A&A
Published: 2014

33. Sulfur implantation in CO and CO2 ices

Author: Hermann Rothard, Alicja Domaracka, Philippe Boduch, Maria Elisabetta Palumbo, J. J. Ding, Giovanni Strazzulla, T. Langlinay, X. Y. Lv, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astrofisico di Catania (OACT), Istituto Nazionale di Astrofisica (INAF), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Carbonic acid, Ion beam, Inorganic chemistry, chemistry.chemical_element, Astronomy and Astrophysics, Chemical reaction, Sulfur, Ion, chemistry.chemical_compound, Ion implantation, chemistry, 13. Climate action, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Carbon dioxide, Molecule, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ComputingMilieux_MISCELLANEOUS
Abstract: We present new experimental results concerning the implantation of multiply charged sulfur ions (90 and 176 keV) in frozen CO and CO2. CO2 layers have been capped with a water ice layer to study chemical reactions induced at the interface between the two species. The results indicate that SO2 is formed after implantation in both CO and CO2 and the respective formation yields are 0.20 +/- 0.05 and 0.38 +/- 0.20 molecules ion(-1) for 176-keV S11+ in CO and 90-keV S9+ in CO2, respectively. Possibly, CS2 has been produced in CO2 and OCS in CO. Ion implantation produces also all of the chemical modifications observed with other ion beam. In particular a large number of carbon chains are formed after implantation in CO. Chemical reactions and mixing are induced at the water/carbon dioxide interface and lead to the formation of carbonic acid (H2CO3). The results are discussed in the light of their relevance in some astrophysical environments both in the star-forming regions and in the Solar system.
Published: 2014

34. Stability of Multiply-Charged Biomolecular Clusters Formed Upon Interaction with Low-Energy Highly Charged Ions

Author: Alicja Domaracka, Jimmy Rangama, Violaine Vizcaino, J. Y. Chesnel, Patrick Rousseau, Bernd A. Huber, A. Méry, Sylvain Maclot, Jean-Christophe Poully, Lamri Adoui, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: chemistry.chemical_classification, [PHYS]Physics [physics], Quantitative Biology::Biomolecules, Charge (physics), Condensed Matter Physics, 7. Clean energy, Stability (probability), Nucleobase, Ion, Amino acid, chemistry.chemical_compound, Monomer, chemistry, Chemical physics, Cluster (physics), Molecule, Physical and Theoretical Chemistry, Atomic physics, Instrumentation, Spectroscopy, ComputingMilieux_MISCELLANEOUS
Abstract: We report on the stability and the processes occurring in clusters of nucleobases and amino acids after multi-ionization upon collisions with highly charged ions. The observed appearance sizes, which are compared with different systems, are found to be slightly lower for amino acids than for nucleobases. As shown by quantum chemical calculations, performed for the doubly-charged α-alanine decamer, this may be partly explained by a rearrangement of the molecules within the cluster, which increases the distance between the charges, thus, reducing the Coulomb repulsion. Hot clusters are stabilized by the emission of neutral monomers occurring, as demonstrated for cytosine clusters, with high intensity on the μs time scale, in particular for clusters of high charge states. This is consistent with a higher energy transfer in the multi-ionization process.
Published: 2014

35. Thermal and energetic processing of ammonia and carbon dioxide bearing solid mixtures

Author: X. Y. Lv, Maria Elisabetta Palumbo, J. J. Ding, Ph. Boduch, T. Langlinay, Hermann Rothard, Giovanni Strazzulla, Alicja Domaracka, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astrofisico di Catania (OACT), Istituto Nazionale di Astrofisica (INAF), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Inorganic chemistry, General Physics and Astronomy, 7. Clean energy, Chemical reaction, Ion, chemistry.chemical_compound, Ammonia, Chemical species, chemistry, 13. Climate action, [SDU]Sciences of the Universe [physics], Carbon dioxide, Ammonium formate, Ammonium carbamate, Molecule, Physical and Theoretical Chemistry, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ComputingMilieux_MISCELLANEOUS
Abstract: We present new experimental results on thermal and ion irradiation processing of frozen ammonia-carbon dioxide mixtures. Some mixtures were deposited at low temperatures (T ≈ 16 K). Upon warming up to 160 K, complex chemical reactions occur leading to the formation of new molecules and, in particular, of ammonium carbamate. We also show that the same species are produced when water is the dominant species in the ternary mixture with ammonia and carbon dioxide. The samples have been irradiated with 144 keV S(9+) ions at 16 K and 50 K. Also in this case, new chemical species are formed as e.g. ammonium formate, CO and OCN(-). The results are discussed in the light of their relevance to the chemical evolution of ices in the interstellar medium and in the solar system. In particular, we suggest searching for them among the gas phase species sublimating from grains around young stellar objects and from the cometary nuclei approaching the Sun.
Published: 2014

36. Interaction of slow highly charged ions with hard dental tissue: studies of fluoride uptake and reminalization efficacy

Author: G Kasperski, Alicja Domaracka, Patrick Rousseau, A Daskalova, A Lawicki, Bulgarian Academy of Sciences (BAS), Gdańsk University of Technology (GUT), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: History, Materials science, Dental material, Analytical chemistry, Mass spectrometry, Education, chemistry.chemical_compound, stomatognathic system, medicine, Dentin, Irradiation, Olaflur, Enamel paint, Radiochemistry, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Tooth enamel, Computer Science Applications, stomatognathic diseases, medicine.anatomical_structure, chemistry, visual_art, Mass spectrum, visual_art.visual_art_medium, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Fluoride, SIMS, medicine.drug
Abstract: International audience; TOF-SIMS mass spectroscopy data are presented on ion irradiation of hard dental tissue using a beam of Xe-129(20+) (15 kV) ions delivered in the ARIBE facility by an ECR source. The investigation was focused on the mass distribution of the fragment ions. A comparison is made between the mass spectra from hard dental tissue treated by olaflur-(C27H60F2N2O3) and untreated hard dental tissue obtained under irradiation by low-energy highly-charged ions (HCIs). We found significant differences between the mass spectra of enamel after introducing amine fluoride (olaflur) and the mass spectra of pure untreated enamel. Further, we separated out the effects caused by radiation induced in the tooth enamel from those induced in dentin, which has not been performed before. In order to conduct a further detailed analysis, it is necessary to extend the research scope to include the influence of fluorine compounds on enamel and dentin.
Published: 2013

37. CHEMICAL PROCESSING OF PURE AMMONIA AND AMMONIA-WATER ICES INDUCED BY HEAVY IONS

Author: E. Seperuelo Duarte, X. Y. Lv, E. F. da Silveira, Philippe Boduch, Vinicius Bordalo, Hermann Rothard, Alicja Domaracka, Pontifical Catholic University of Rio de Janeiro (PUC), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Astrochemistry, 010504 meteorology & atmospheric sciences, Hydrazine, Analytical chemistry, chemistry.chemical_element, Astronomy and Astrophysics, 01 natural sciences, Nitrogen, Ion, chemistry.chemical_compound, Ammonia, chemistry, 13. Climate action, Space and Planetary Science, 0103 physical sciences, Radiolysis, Nitrogen dioxide, Irradiation, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract: Cosmic rays are possibly the main agents to prevent the freeze-out of molecules onto grain surfaces in cold dense clouds. Ammonia (NH3) is one of the most abundant molecules present in dust ice mantles, with a concentration of up to 15% relative to water (H2O). FTIR spectroscopy is used to monitor pure NH3 and NH3-H2 Oi ce samples as they are irradiated with Ni and Zn ion beams (500-600 MeV) at GANIL/France. New species, such as hydrazine (N2H4), diazene (N2H2 isomers), molecular hydrogen (H2), and nitrogen (N2) were identified after irradiation of pure NH3 ices. Nitrous oxide (N2O), nitrogen oxide (NO), nitrogen dioxide (NO2), and hydroxylamine (NH2OH) are some of the products of the NH3-H2O ice radiolysis. The spectral band at 6.85 μm was observed after irradiation of both types of ice. Besides the likely contribution of ammonium (NH + ) and amino (NH2) radicals, data suggest a small contribution of NH2OH to this band profile after high fluences of irradiation of NH3-H2O ices. The spectral shift of the NH3 "umbrella" mode (9.3 μm) band is parameterized as a function of NH3/H2O ratio in amorphous ices. Ammonia and water destruction cross-sections are obtained, as well as the rate of NH3-H2O (1:10) ice compaction, measured by the OH dangling bond destruction cross-section. Ammonia destruction is enhanced in the presence of H2O in the ice and a power law relationship between stopping power and NH3 destruction cross-section is verified. Such results may provide relevant information for the evolution of molecular species in dense molecular clouds.
Published: 2013

38. Ions colliding with polycyclic aromatic hydrocarbon clusters

Author: A. Méry, Henrik Cederquist, M. Capron, A. Ławicki, Lamri Adoui, Jimmy Rangama, Bernd A. Huber, John D. Alexander, Bruno Manil, Mark H. Stockett, J. Y. Chesnel, Michael Gatchell, Henning Zettergren, Sylvain Maclot, Tao Chen, Henning T. Schmidt, Patrick Rousseau, R. Maisonny, Alicja Domaracka, F. Seitz, Department of Physics [Stockholm], Stockholm University, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers (LPL), Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)
Subjects: chemistry.chemical_classification, [PHYS]Physics [physics], Chemistry, Polycyclic aromatic hydrocarbon, Condensed Matter Physics, 01 natural sciences, Molecular physics, Atomic and Molecular Physics, and Optics, Ion, chemistry.chemical_compound, Monomer, Fragmentation (mass spectrometry), Ionization, Intramolecular force, 0103 physical sciences, Coulomb, Molecule, Physics::Chemical Physics, Atomic physics, 010306 general physics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Mathematical Physics, ComputingMilieux_MISCELLANEOUS
Abstract: We have measured the ionization and fragmentation of polycyclic aromatic hydrocarbon (PAH) molecules and their clusters. We find that PAH clusters containing up to roughly 100 individual molecules fragment strongly following collisions with keV ions in low or high charge states (q). For both types of collisions, singly charged PAH molecules are found to be the dominant products but for very different reasons. A high-q ion projectile charge leads to strong multiple ionization of the PAH clusters and subsequent Coulomb explosions. A low-q ion projectile charge often leads to single ionization but stronger internal heating and long evaporation sequences with a singly charged PAH monomer as the end product. We have developed a Monte Carlo method for collision-induced heating of PAH clusters and present an evaporation model where the clusters cool slowly as most of the internal energies are stored in intramolecular vibrations and not in molecule-molecule vibrations.
Published: 2013

39. Chemical reactions induced in frozen formic acid by heavy ion cosmic rays

Author: Enio F. da Silveira, Philippe Boduch, Diana P. P. Andrade, Alicja Domaracka, Ana L. F. de Barros, Sergio Pilling, Hermann Rothard, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (Rio de Janeiro) ( CEFET/RJ), Universidade do Vale do Paraíba (UNIVAP), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Pontifical Catholic University of Rio de Janeiro (PUC), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Formic acid, Analytical chemistry, Astronomy and Astrophysics, 010402 general chemistry, Mass spectrometry, 7. Clean energy, 01 natural sciences, Chemical reaction, 0104 chemical sciences, Ion, chemistry.chemical_compound, Chemical species, chemistry, 13. Climate action, Space and Planetary Science, Yield (chemistry), 0103 physical sciences, Radiolysis, Molecule, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS
Abstract: We studied the effects produced by the interaction of heavy ion cosmic rays with interstellar and cometary organic molecules in the solid phase. Formic acid (HCOOH) ice at 15 K was irradiated by 267-MeV 56Fe22+ ions and the chemical evolution was analysed using Fourier transform infrared spectroscopy. The destruction cross-section of HCOOH and the formation cross-sections of the produced molecular species have been determined; the sputtering yield values are also discussed. The most abundant chemical species formed by Fe ion irradiation are CO, CO2 and H2O. The half-life of frozen formic acid molecules in the interstellar medium, as a result of interaction with the different cosmic ray constituents, is evaluated to be 108 yr, considering that the destruction cross-section σ d of heavy ions is ruled by a power law as a function of the electronic stopping power Se (i.e. σd ∼ S3/2 e ). Moreover, a complementary study based on mass spectrometry data from the literature has been performed, in order to understand the HCOOH molecule radiolysis, the desorption of its product and the chemical reaction pathways in ice.
Published: 2013

40. Interaction of nucleobase clusters with multiply charged ions: Insight into base pairing

Author: Jean-Yves Chesnel, Patrick Rousseau, A Lawicki, A. Méry, Ronnie Hoekstra, Alicja Domaracka, Lamri Adoui, Bruno Manil, Sylvain Maclot, J. Postma, V. Bernigaud, M. Capron, Jimmy Rangama, Jean-Christophe Poully, Bernd A. Huber, Thomas Schlathölter, E Lattouf, Sadia Bari, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), KVI Atomic and Molecular Physics (KVI), University of Groningen [Groningen], Laboratoire de Physique des Lasers (LPL), Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS]Physics [physics], Quantitative Biology::Biomolecules, History, Chemistry, Base pair, 010401 analytical chemistry, 010402 general chemistry, Quantitative Biology::Genomics, 01 natural sciences, Charged particle, 0104 chemical sciences, 3. Good health, Computer Science Applications, Education, Ion, Nucleobase, chemistry.chemical_compound, Computational chemistry, Mass spectrum, Nucleic acid, Selectivity, DNA, ComputingMilieux_MISCELLANEOUS
Abstract: We have studied the collision of low energy multiply charged ions with mixed nucleobases clusters. Mass spectra of the products show selectivity between particular nucleic bases. We could explain this enhanced stability considering base pairing occurring in DNA or RNA.
Published: 2012

41. Ionization and fragmentation of polycyclic aromatic hydrocarbon clusters in collisions with keV ions

Author: E. Lattouf, Henning Zettergren, J. Y. Chesnel, R. Maisonny, H. A. B. Johansson, F. Seitz, Henrik Cederquist, Sylvain Maclot, M. Capron, Bruno Manil, A. Ławicki, Bernd A. Huber, Henning T. Schmidt, Alicja Domaracka, Patrick Rousseau, Lamri Adoui, Anne I. S. Holm, Department of Physics [Stockholm], Stockholm University, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers (LPL), Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, [PHYS]Physics [physics], 010304 chemical physics, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Coulomb explosion, 01 natural sciences, Atomic and Molecular Physics, and Optics, Charged particle, Ion source, Coronene, Ion, chemistry.chemical_compound, Fragmentation (mass spectrometry), chemistry, Ionization, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Molecule, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: In this thesis a series of experiments on collisions between atomic projectile ions at keV energies and target vapors of either isolated molecules or van der Waals clusters is presented and analyzed. The atomic ions are produced in an Electron Cyclotron Resonance (ECR) ion source, accelerated and guided into the target volume. The charged target collision products are mass-to-charge analyzed in a time-of-flight spectrometer. The Polycyclic Aromatic Hyrdrocarbons (PAHs) Anthracene (C14H10), Coronene (C24H12), two C16H10 isomers, Pyrene and Fluoranthene, and the fullerene C60 are examined.For projectile ions in low charge states, small impact parameter collisions dominate, which leads to internal heating of the target. With isolated molecules as targets, this typically results in ionization and often also in fragmentation. For cluster targets energy and charge are rapidly distributed among the cluster building blocks. This is followed by cluster evaporation and very limited fragmentation of the individual molecules. C119+ and C118+ are observed as products. These are due to the formation of the reactive C58/59+ ions by direct knockout processes, which react with another C60 of the cluster to form dumb-bell shaped molecules.For projectile ions of high charge (Xe20+) larger impact parameters dominate, leading to little internal heating. For isolated molecule targets, intact molecular ions are the main collision products. Charged fragments stem mostly from multifragmentation following ionization to high charge states. For cluster targets, the collision products consist mainly of singly charged monomers. Fragmentation of the individual molecules is comparatively strong. This suggests a quick distribution of charges followed by a Coulomb explosion, which leads to internal heating.The results show that weakly bound clusters do not sustain the impact of keV-ions and that it is possible to form new molecular structures.
Published: 2011

42. Polycyclic aromatic hydrocarbon-isomer fragmentation pathways: case study for pyrene and fluoranthene molecules and clusters

Author: A. Ławicki, H. A. B. Johansson, Alicja Domaracka, Henrik Cederquist, Lamri Adoui, Henning Zettergren, Anne I. S. Holm, F. Seitz, Stefan Rosén, A. Méry, Bruno Manil, Bernd A. Huber, Patrick Rousseau, R. Maisonny, Jimmy Rangama, M. Capron, Henning T. Schmidt, Department of Physics [Stockholm], Stockholm University, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers (LPL), Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS), AlbaNova University Center, Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS]Physics [physics], Fluoranthene, chemistry.chemical_classification, General Physics and Astronomy, Polycyclic aromatic hydrocarbon, Photochemistry, 01 natural sciences, Dissociation (chemistry), 3. Good health, chemistry.chemical_compound, chemistry, Fragmentation (mass spectrometry), Ionization, 0103 physical sciences, Molecule, Pyrene, Physical and Theoretical Chemistry, 010306 general physics, 010303 astronomy & astrophysics, Isomerization, ComputingMilieux_MISCELLANEOUS
Abstract: We report on measurements of the ionization and fragmentation of polycyclic aromatic hydrocarbon (PAH) targets in Xe(20+) + C(16)H(10) and Xe(20+) + [C(16)H(10)](k) collisions and compare results for the two C(16)H(10) isomers: pyrene and fluoranthene. For both types of targets, i.e., for single PAH molecules isolated in vacuum or for isomerically pure clusters of one of the molecules, the resulting fragment spectra are surprisingly similar. However, we do observe weak but significant isomer effects. Although these are manifested in very different ways for the monomer and cluster targets, they both have at their roots small differences (2.5 eV) between the total binding energies of neutral, and singly and multiply charged pyrene and fluoranthene monomers. The results will be discussed in view of the density functional theory calculations of ionization and dissociation energies for fluoranthene and pyrene. A simple classical over-the-barrier model is used to estimate cross sections for single- and multiple-electron transfer between PAHs and ions. Calculated single and multiple ionization energies, and the corresponding model PAH ionization cross sections, are given.
Published: 2011

43. Cosmic ray impact on astrophysical ices: laboratory studies on heavy ion irradiation of methane

Author: A. L. F. de Barros, Vinicius Bordalo, Philippe Boduch, Alicja Domaracka, E. F. da Silveira, Hermann Rothard, E. Seperuelo Duarte, Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (Rio de Janeiro) ( CEFET/RJ), Pontifical Catholic University of Rio de Janeiro (PUC), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Astrochemistry, 010504 meteorology & atmospheric sciences, Ion beam, Analytical chemistry, Infrared spectroscopy, Astrophysics, 01 natural sciences, 7. Clean energy, Methane, Dissociation (chemistry), Ion, chemistry.chemical_compound, 0103 physical sciences, Irradiation, Physics::Chemical Physics, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Physics, Astronomy and Astrophysics, chemistry, 13. Climate action, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Radiolysis, Astrophysics::Earth and Planetary Astrophysics, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: Laboratory data of CH4 ice radiolysis promoted by fast heavy ions are obtained by infrared spectroscopy (FTIR). CH4 molecules are condensed on a CsI substrate at 15 K, and the ice layer is bombarded by 220 MeV 16 O 7+ ion beam. The ice thickness is thin enough to be traversed by projectiles at constant velocity close to the equilibrium charge state. The induced CH4 dissociation gives rise to the formation of molecular species CH3 ,C 2H2 ,C 2H4 ,C 2H6 ,a nd C 3H8. Their formation and dissociation cross sections are determined. C2H6 represent the most abundant daughter molecules. The carbon budget analysis of CH4 and its radiolysis products shows that the column density of carbon atoms contained in the methane destroyed during ion irradiation is 30−50% greater than the sum for the column densities of the newly formed species. As an astrophysical implication, the current results allow estimation of chemical reaction rates in ices covering interstellar grains.
Published: 2011

44. Production of Oxidants by Ion Bombardment of Icy Moons in the Outer Solar System

Author: Philippe Boduch, Alicja Domaracka, Eduardo Seperuelo Duarte, Enio F. da Silveira, Xue Yang Lv, Giovanni Strazzulla, Hermann Rothard, Sergio Pilling, Maria Elisabetta Palumbo, and Oscar Gomis
Subjects: Physics, Solar System, Ozone, Article Subject, lcsh:Astronomy, Astronomy and Astrophysics, Photochemistry, Icy moon, Astrobiology, Ion, Physics::Geophysics, lcsh:QB1-991, chemistry.chemical_compound, chemistry, Space and Planetary Science, FISICA APLICADA, Carbon dioxide, Irradiation, Astrophysics::Earth and Planetary Astrophysics, Hydrogen peroxide, Energy source
Abstract: Our groups in Brazil, France and Italy have been active, among others in the world, in performing experiments on physical-chemical effects induced by fast ions colliding with solids (frozen gases, carbonaceous and organic materials, silicates, etc.) of astrophysical interest. The used ions span a very large range of energies, from a few keV to hundreds MeV. Here we present a summary of the results obtained so far on the formation of oxidants (hydrogen peroxide and ozone) after ion irradiation of frozen water, carbon dioxide and their mixtures. Irradiation of pure water ice produces hydrogen peroxide whatever is the used ion and at different temperatures. Irradiation of carbon dioxide and water frozen mixtures result in the production of molecules among which hydrogen peroxide and ozone. The experimental results are discussed in the light of the relevance they have to support the presence of an energy source for biosphere on Europa and other icy moons in the outer Solar System., This research has been supported by the European COST Action CM0805: The Chemical Cosmos.
Published: 2011

45. Radiolysis of ammonia-containing ices by heavy cosmic rays inside dense molecular clouds

Author: Philippe Boduch, Eduardo Seperuelo Duarte, Emmanuel Balanzat, Enio F. da Silveira, Sergio Pilling, Alicja Domaracka, Hermann Rothard, Pontifícia Universidade Católica, Departamento de Física (PUC), Pontifícia Universidade Católica, Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraiba (UNIVAP), Grupo de Fisica e Astronomia (CEFET/Quimica de Nilopolis), CEFET-RN : Federal Center for Technological Education of Rio Grande do Norte, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), K. Cunha, M. Spite, B. Barbuy, Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Brassy, Chantal, and K. Cunha, M. Spite, B. Barbuy
Subjects: Astrochemistry, molecular data, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Analytical chemistry, astrobiology, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Infrared spectroscopy, Cosmic ray, 01 natural sciences, ISM: clouds, Dissociation (chemistry), Ion, methods: laboratory, chemistry.chemical_compound, cosmic rays, [PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], [CHIM.RADIO] Chemical Sciences/Radiochemistry, 0103 physical sciences, Physics::Chemical Physics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, Chemistry, astrochemistry, Molecular cloud, Astronomy and Astrophysics, [PHYS.ASTR.EP] Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], molecular processes, 13. Climate action, Space and Planetary Science, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Radiolysis, Astrophysics::Earth and Planetary Astrophysics, Atomic physics, [CHIM.RADIO]Chemical Sciences/Radiochemistry, Carbon monoxide
Abstract: We present experimental studies on the interaction of heavy, highly charged and energetic ions (46 MeV 58Ni13+) with interstellar ammonia-containing (H2O:NH3:CO) ice analog in an attempt to simulate the physical chemistry induced by heavy ion cosmic rays inside dense astrophysical environments. The measurements were performed at the heavy ion accelerator GANIL in Caen, France. In-situ analysis have been performed by a Fourier transform infrared spectrometer. The averaged values for the dissociation cross section of water, ammonia and carbon monoxide are determined and the estimated half life for the studied species inside dense molecular clouds is 2-3 × 106 years. The IR spectra of organic residue produced by the radiolysis have revealed, at room temperature, five bands that are tentatively assigned to vibration modes of the zwitterionic glycine (NH3+CH2COO−).
Published: 2009

46. Collisions of electrons with trimethylphosphine[P(CH3)3]molecules

Author: Paweł Możejko, Elżbieta Ptasińska-Denga, Alicja Domaracka, and Czesław Szmytkowski
Subjects: Physics, Cross section (physics), chemistry.chemical_compound, chemistry, Scattering, Ionization, Atom, Trimethylphosphine, Molecule, Electron, Atomic physics, Atomic and Molecular Physics, and Optics, Energy (signal processing)
Abstract: We report on the absolute total electron-trimethylphosphine scattering cross section (TCS) measured from 0.4 to 400 eV using a linear electron-beam attenuation method. The experimental TCS energy function exhibits very pronounced asymmetric enhancement peaked near 5.5 eV. Calculations were also carried out to obtain the integral elastic and ionization cross sections at intermediate and high energies using the independent atom and the binary-encounter-Bethe approximations, respectively. Their sum, the computed total cross section, is for intermediate energies in a reasonable agreement with the present experimental TCS data. Furthermore, the measured TCS for P(CH{sub 3}){sub 3} is compared with the TCSs for some other phosphines [PH{sub 3}, PF{sub 3}] and other methides [B(CD{sub 3}){sub 3}, N(CH{sub 3}){sub 3}]. Analysis clearly shows that exterior atoms of a molecule influence the scattering process more significantly than the central atom.
Published: 2007

47. Ion-Induced Reactivity in Pyrene Clusters

Author: A. Méry, Alicja Domaracka, Lamri Adoui, Sylvain Maclot, Henning Zettergren, Mark H. Stockett, Tao Chen, R. Delaunay, Bernd A. Huber, Patrick Rousseau, Michael Gatchell, and Henrik Cederquist
Subjects: History, Projectile, Charged particle, Computer Science Applications, Education, Ion, chemistry.chemical_compound, Molecular dynamics, chemistry, Mass spectrum, Cluster (physics), Pyrene, Molecule, Atomic physics, Nuclear Experiment
Abstract: We report experimental indications of chemical reactions inside clusters of pyrene (C16H10) molecules following collisions with 11.25 keV He+ - and 12.0 keV Ar2+ ions. It appears that bond-forming reactions are more likely with the heavier projectile. We have also performed classical molecular dynamics simulations of these processes where we treat the interaction between the projectiles and all atoms in the cluster as well as non-dispersive and dispersive forces between all atoms in the cluster before, during and after the collision. The time step is typically 10−17 s and the total simulation time 1 picosecond. The simulations were performed for a fixed cluster size with 36 pyrene molecules, although there is a broad range of cluster sizes in the experiment. Still, there is good qualitative agreement between the experimental and the simulated mass spectra exhibiting reaction products with masses between those of the C16H10- monomer and dimer in both cases. Additional studies of the influence of the projectile charge and mass is planned as well as simulations on longer time scales and as functions of cluster size.
Published: 2015

48. Electron collisions with boron trichloride(BCl3)molecules

Author: Czesław Szmytkowski, Elżbieta Ptasińska-Denga, and Alicja Domaracka
Subjects: Physics, Range (particle radiation), Scattering, chemistry.chemical_element, Electron, Boron trichloride, Atomic and Molecular Physics, and Optics, chemistry.chemical_compound, chemistry, Molecule, Atomic physics, Boron, Electron scattering, Energy (signal processing)
Abstract: Absolute total cross section (TCS) for electron scattering by boron trichloride (BCl{sub 3}) molecules has been measured in a linear transmission method under single collision conditions. Measurements have been performed within electron energy range from 0.3 to 370 eV. The TCS energy function for BCl{sub 3} is dominated with very pronounced enhancement peaked near 10 eV (61x10{sup -20} m{sup 2} in the maximum). Low-energy slope of the enhancement is superimposed with two resonantlike structures located near 3.2 and 6.0 eV. On the descending high-energy side of the TCS curve only a weak shoulder between 30 and 60 eV is discernible. The present TCS is compared with the existing experimental and calculated cross sections for particular e{sup -}-BCl{sub 3} scattering processes. Furthermore, the TCS for BCl{sub 3} is also confronted with the TCS for BF{sub 3} and the role of peripheral atoms in molecule is indicated and discussed.
Published: 2005

49. Electron collisions with nitrogen trifluoride(NF3)molecules

Author: Alicja Domaracka, Paweł Możejko, Elżbieta Ptasińska-Denga, Łukasz Kłosowski, Czesław Szmytkowski, Michał Piotrowicz, and Grzegorz Kasperski
Subjects: Physics, Hydrogen, chemistry.chemical_element, Electron, Nitrogen trifluoride, Atomic and Molecular Physics, and Optics, chemistry.chemical_compound, chemistry, Ionization, Atom, Fluorine, Molecule, Atomic physics, Energy (signal processing)
Abstract: Absolute total cross sections (TCS's) for 0.5-370-eV electrons scattered by nitrogen trifluoride (NF{sub 3}) molecules have been measured using a linear transmission method under single collision conditions. It was found that the TCS energy function for NF{sub 3} is dominated with two pronounced enhancements: one resonantlike centered between 2 and 3 eV with the maximum value of 28x10{sup -20} m{sup 2} followed with a minimum at around 7-12 eV({approx}17x10{sup -20} m{sup 2}), and the second much broader enhancement located around 40 eV (19x10{sup -20} m{sup 2} in the maximum). The low-energy enhancement is superimposed with some weak features located near 1.8, 2.2, and 2.8 eV. The integral elastic cross section has been calculated at intermediate energies using an independent atom method with a static plus polarization model potential. The cross section for ionization has been computed as well using the binary-encounter-Bethe approach. The sum of calculated cross sections reasonably reproduces the intermediate-energy experimental TCS, with respect to the shape and value. The TCS for NF{sub 3} is also compared with the TCS for ammonia (NH{sub 3}) which was supplementary measured and the effect of substitution of fluorine atoms for hydrogen (perfluorination effect) is demonstrated and discussed.
Published: 2004

50. Ion interactions with pure and mixed water clusters

Author: Alicja Domaracka, Michael Capron, Patrick Rousseau, Lamri Adoui, Bernd A. Huber, A. Méry, Jean-Christophe Poully, Sylvain Maclot, R. Maisonny, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Atomes, Molécules et Agrégats (AMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN)
Subjects: History, Dimer, Inorganic chemistry, Evaporation, Collisions of ions and atomic/molecular targets, Protonation, 01 natural sciences, Education, Ion, chemistry.chemical_compound, 0103 physical sciences, Molecule, Nuclear Experiment, 010306 general physics, Biomolecules, Quantitative Biology::Biomolecules, 010304 chemical physics, Chemistry, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], Water, Charged particle, Computer Science Applications, Crystallography, Monomer, Cluster, Excited state, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Abstract: International audience; We report on collisions of highly charged Xe20+ ions with weakly bound clusters of water molecules and water/adenine mixtures. Singly and doubly charged water clusters are observed in the size range of n=1 to 65 and n=49 to 61, respectively. In contrast to other comparable systems, the dominant monomer fragment (H3O+) is formed with very low kinetic energy, hence indicating that it is formed by evaporation processes. Larger fragments are produced with larger kinetic energies due to charge-separating processes. Furthermore, water clusters are found to be protonated, only a very small amount of the non protonated dimer (H2O)(2)(+) is observed. Excited mixed adenine/water clusters fragment by the loss of the surrounding water molecules, thus, adenine fragments are formed without water molecules attached. In addition, the adenine monomer is found to be partly protonated.
Published: 2013

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