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276 results on '"Adoui L."'

1. Low intensity threshold values for keV X-ray production in laser-cluster interaction

Author

Prigent, C., Adoui, L., Lamour, E., Rozet, J. -P., Vernhet, D., Gobert, O., Meynadier, P., Normand, D., and Perdrix, M.

Subjects
Physics - Atomic and Molecular Clusters, Physics - Atomic Physics
Abstract

Absolute Ar XK (3 keV) and Xe XL (4 keV) photon yields are measured as a function of laser peak intensity, for large (104 - 105 atoms) argon and xenon clusters submitted to intense laser pulses. A clear threshold behavior is observed. The intensity threshold is found as low as 2 1014 Wcm-2, a value matching the production of singly-charged argon or doubly-charged xenon by optical field ionization. Possible mechanisms involved in the inner-shell ionization are discussed. The outcome on the optimization of keV X-ray production is underlined., Comment: 1 table, 4 figures. submitted to Physical Review Letters

Published
2005

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

Author

Rousseau P., González-Vázquez J., Piekarski D.G., Kopyra J., Domaracka A., Alcamí M., Adoui L., Huber B.A., Díaz-Tendero S., Martín, Fernando, Rousseau P., González-Vázquez J., Piekarski D.G., Kopyra J., Domaracka A., Alcamí M., Adoui L., Huber B.A., Díaz-Tendero S., and Martín, Fernando

Published
2021

7. Polypeptide formation in clusters of β-alanine amino acids by single ion impact

Author

Rousseau P., Piekarski D.G., Capron M., Domaracka A., Adoui L., Martín F., Alcamí M., Díaz-Tendero S., Huber B.A. and 'The experiments have been performed at the ARIBE facility, part of large-scale infrastructure GANIL. The research was conducted in the framework of the International Associated Laboratory (LIA) Fragmentation DYNAmics of complex MOlecular systems —DYNAMO, funded by the Centre National de la Recherche Scientifique (CNRS) and in the frame of the COST action CA18212 Molecular Dynamics in the GAS phase (MD-GAS). We further acknowledge the technical support by J.-M. Ramillon, C. Feierstein, and T. Been, and the contributions of B. Manil, V. Bernigaud, T. Schlathölter, R. Hoekstra, and S. Bari in earlier studies. The authors acknowledge the generous allocation of computer time at the Centro de Computación Científica at the Universidad Autónoma de Madrid (CCC-UAM). This work was partially supported by the MICINN—Spanish Ministry of Science and Innovation—projects FIS2016-77889-R and CTQ2016-76061-P, 'Severo Ochoa' Programme for Centres of Excellence in R & D (SEV-2016-0686) and 'María de Maeztu' Programme for Units of Excellence in R & D (CEX2018-000805-M).'

Published
2020

9. Ion slowing down and charge exchange at small impact parameters selected by channeling: Superdensity effects

Author

L’Hoir, A., Adoui, L., Barrué, F., Billebaud, A., Bosch, F., Bräuning-Demian, A., Bräuning, H., Cassimi, A., Chevallier, M., Cohen, C., Dauvergne, D., Demonchy, C.E., Giot, L., Kirsch, R., Gumberidze, A., Kozhuharov, C., Liesen, D., Mittig, W., Mokler, P.H., Pita, S., Poizat, J.-C., Ray, C., Roussel-Chomaz, P., Rothard, H., Rozet, J.-P., Stöhlker, Th., Tarisien, M., Testa, E., Toleikis, S., Toulemonde, M., and Vernhet, D.

Published
2006
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10. The low energy beamline of the FISIC experiment: current status of construction and performance

Author

Schury, D, primary, Méry, A, additional, Ramillon, J M, additional, Adoui, L, additional, Chesnel, J-Y, additional, Lévy, A, additional, Macé, S, additional, Prigent, C, additional, Rangama, J, additional, Rousseau, P, additional, Steydli, S, additional, Trassinelli, M, additional, Vernhet, D, additional, Gumberidze, A, additional, Stöhlker, Th, additional, Bräuning-Demian, A, additional, Hahn, C, additional, Spillmann, U, additional, and Lamour, E, additional

Published
2020
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15. Formation of H2 from internally heated polycyclic aromatic hydrocarbons: Excitation energy dependence.

Author

Chen, T., Gatchell, M., Stockett, M. H., Delaunay, R., Domaracka, A., Micelotta, E. R., Tielens, A. G. G. M., Rousseau, P., Adoui, L., Huber, B. A., Schmidt, H. T., Cederquist, H., and Zettergren, H.

Subjects
POLYCYCLIC aromatic hydrocarbons, ENERGY security, HEATING, MOLECULAR structure, COLLISIONS (Physics)
Abstract

We have investigated the effectiveness of molecular hydrogen (H2) formation from Polycyclic Aromatic Hydrocarbons (PAHs) which are internally heated by collisions with keV ions. The present and earlier experimental results are analyzed in view of molecular structure calculations and a simple collision model. We estimate that H2 formation becomes important for internal PAH temperatures exceeding about 2200 K, regardless of the PAH size and the excitation agent. This suggests that keV ions may effectively induce such reactions, while they are unlikely due to, e.g., absorption of single photons with energies below the Lyman limit. The present analysis also suggests that H2 emission is correlated with multi-fragmentation processes, which means that the [PAH-2H]+ peak intensities in the mass spectra may not be used for estimating H2-formation rates. [ABSTRACT FROM AUTHOR]

Published
2015
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16. Absolute fragmentation cross sections in atom-molecule collisions: Scaling laws for non-statistical fragmentation of polycyclic aromatic hydrocarbon molecules.

Author

Chen, T., Gatchell, M., Stockett, M. H., Alexander, J. D., Zhang, Y., Rousseau, P., Domaracka, A., Maclot, S., Delaunay, R., Adoui, L., Huber, B. A., Schlathölter, T., Schmidt, H. T., Cederquist, H., and Zettergren, H.

Subjects
COLLISIONS (Nuclear physics), SCALING laws (Statistical physics), PARTICLES (Nuclear physics), POLYCYCLIC aromatic compounds, NUCLEAR reactions, ORGANIC compounds, PHYSICAL & theoretical chemistry
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2014
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17. Shock-driven formation of covalently bound carbon nanoparticles from ion collisions with clusters of C-60 fullerenes

Author

Delaunay, R., Gatchell, Michael, Mika, A., Domaracka, A., Adoui, L., Zettergren, Henning, Cederquist, Henrik, Rousseau, P., Huber, B. A., Delaunay, R., Gatchell, Michael, Mika, A., Domaracka, A., Adoui, L., Zettergren, Henning, Cederquist, Henrik, Rousseau, P., and Huber, B. A.

Abstract

We show that the energetic processing of C-60 clusters by slow atomic projectiles leads to ultrafast (< ps) formation of large covalent carbon nanoparticles containing a few hundreds of atoms. The underlying mechanism is found to be due to impulse-driven collisions between the projectile and the nuclei of the molecules. Experimental findings are well reproduced by classical molecular dynamics simulations. The cross sections for molecular growth processes forming covalent systems which contain more than 60 carbon atoms are about 5.10(-14) cm(2) representing more than 70% of the geometrical cross sections. This demonstrates the high efficiency of the underlying processes. The formed carbon nanoparticles contain both aromatic and aliphatic structures which have also been considered as dust components in space.

Published
2018
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20. Polycyclic aromatic hydrocarbon-isomer fragmentation pathways: Case study for pyrene and fluoranthene molecules and clusters.

Author

Seitz, F., Holm, A. I. S., Zettergren, H., Johansson, H. A. B., Rosén, S., Schmidt, H. T., Ławicki, A., Rangama, J., Rousseau, P., Capron, M., Maisonny, R., Domaracka, A., Adoui, L., Méry, A., Manil, B., Huber, B. A., and Cederquist, H.

Subjects
POLYCYCLIC aromatic hydrocarbons, FRAGMENTATION reactions, IONIZATION (Atomic physics), COLLISIONS (Nuclear physics), NUCLEAR isomers, BINDING energy, CHARGE exchange, MICROCLUSTERS
Abstract

We report on measurements of the ionization and fragmentation of polycyclic aromatic hydrocarbon (PAH) targets in Xe20 + + C16H10 and Xe20 + + [C16H10]k collisions and compare results for the two C16H10 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. [ABSTRACT FROM AUTHOR]

Published
2011
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21. The H2O2+ potential energy surfaces dissociating into H+/OH+: Theoretical analysis of the isotopic effect.

Author

Gervais, B., Giglio, E., Adoui, L., Cassimi, A., Duflot, D., and Galassi, M. E.

Subjects
QUANTUM chemistry, POTENTIAL energy surfaces, ANGULAR momentum (Mechanics), SCISSION (Chemistry), ANGULAR momentum (Nuclear physics), MOMENTUM (Mechanics), BIOMECHANICS
Abstract

We present a detailed study of the potential energy surfaces of the water dication correlating asymptotically with O(3P) and O(1D). Using ab initio multireference configuration interaction method, we computed a large ensemble of data, which was used to generate a fit of each potential energy surface for bending angles θ≥80° degrees and OH distances ROH≥1.0 a.u. The fit is used to investigate the dissociation dynamics along each potential energy surface for several initial geometries corresponding to Franck–Condon transition from neutral or singly ionized water molecule. For each case, we determine the dissociation channels and we compute the kinetic energy release and angular momentum distribution of the final arrangements. Among the eight potential energy surfaces investigated here, only the lowest triplet and the three lowest singlet can lead to the formation of bound residual fragment. The dissociation of HOD2+ presents a strong preference for OH rather than OD bond breakage. It is characterized by the isotopic ratio, defined as the number of OD+ over the number of OH+ residual fragments. This ratio depends strongly on the shape of each potential energy surface and on the initial conditions. [ABSTRACT FROM AUTHOR]

Published
2009
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25. Numerical simulations of purification and final charge state analysis of the slow ion beam for the FISIC project

Author

Kumar, A., primary, Méry, A., additional, Adoui, L., additional, Chesnel, JY., additional, Lévy, A., additional, Macé, S., additional, Prigent, C., additional, Ramillon, JM., additional, Rangama, J., additional, Rozet, JP., additional, Rousseau, P., additional, Steydli, S., additional, Trassinelli, M., additional, Vernhet, D., additional, and Lamour, E., additional

Published
2017
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28. Charge and energy flows in ionised thymidine

Author

Maclot S., Delaunay R., Piekarski D.G., Domaracka A., Huber B.A., Adoui L., Martin F., Alcamf M., Avaldi L., Bolognesi P., Diaz-Tendero S., Rousseau P.

Published
2015

33. Physical Chemistry Chemical Physics

Author

Piekarski D.G., Delaunay R., Maclot S., Adoui L., Martín F., Alcamí M., Huber B.A., Rousseau P., Domaracka A., Díaz-Tendero S.

Published
2015

34. Determination of Energy-Transfer Distributions in Ionizing Ion-Molecule Collisions

Author

Maclot S., Delaunay R., Piekarski D.G., Domaracka A., Huber B.A., Adoui L., Martín, Fernando, Alcamí M., Avaldi L., Bolognesi P., Díaz-Tendero S., Rousseau P., Maclot S., Delaunay R., Piekarski D.G., Domaracka A., Huber B.A., Adoui L., Martín, Fernando, Alcamí M., Avaldi L., Bolognesi P., Díaz-Tendero S., and Rousseau P.

Published
2016

36. Projet CAHAPS : Caractérisation en ligne de l’Adsorption d’Hydrocarbures Aromatiques Polycycliques par les suies

Author

Yon, Jerôme, Saidani, G., Rousseau, P., Huber, B., Domaracka, A., Coppalle, A., Adoui, L., Yon, Jérôme, Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Centre National de la Recherche Scientifique (CNRS)-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)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), 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), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-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), 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), and 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)

Subjects
TheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGES, ComputingMilieux_THECOMPUTINGPROFESSION, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, [SPI.FLUID] Engineering Sciences [physics]/Reactive fluid environment, ComputingMilieux_MISCELLANEOUS
Abstract

National audience; Yes

Published
2014

37. Bond formation in C+59-C60 collisions

Author

Zettergren H., Rousseau P., Wang Y., Seitz F., Chen T., Gatchell M., Alexander J.D., Stockett M.H., Rangama J., Chesnel J.Y., Capron M., Poully J.C., Domaracka A., Méry A., Maclot S., Vizcaino V., Schmidt H.T., Adoui L., Alcamí M., Tielens A.G.G.M., Martín F., Huber B.A., Cederquist H.

Published
2014

39. Formation dynamics of fullerene dimers C118+, C119+, and C120+

Author

Wang, Y., Zettergren, H., Rousseau, Patrick, Chen, T., Gatchell, M., Stockett, M. H., Domaracka, A., Adoui, L., Huber, B. A., Cederquist, H., Alcamí, M., Martín, F., Departamento de Qímica, Módulo 13, Universidad Autónoma de Madrid, Departamento de Qímica, 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.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Abstract

International audience; Dumbbell-shaped fullerene dimers C-118(+) and C-119(+) have recently been observed in mass spectra resulting from collisions between clusters of C-60 molecules and keV He2+ or Ar2+ ions [H. Zettergren et al., Phys. Rev. Lett. 110, 185501 (2013) and F. Seitz et al., J. Chem. Phys. 139, 034309 (2013)]. To unveil the formation mechanisms of these fullerene dimers, systematic molecular dynamics (MD) simulations based on the self-consistent charge density functional tight-binding method have been performed for C-n(+) + C-60 (n = 58,59,60) collisions following prompt atom knockouts by the fast ions. The statistics from the MD simulations indicate a much higher reactivity of C-59(+) and C-58(+) fragments compared to that of C-60(+). It is found that the covalently bonded dumbbell-shaped fullerene dimers C-118(+) and C-119(+) can be formed at very low-collision energies within 1 ps and are stable enough to survive on the microsecond time scale of the experiment. The thermodynamic and kinetic stabilities, as well as the bonding features, have been investigated for the most stable dumbbell dimers C-118(+), C-119(+), and C-120(+).

Published
2014

41. Multiple electron capture, excitation, and fragmentation in C6+-C-60 collisions

Author

Da Silva H., Oller J., Gatchell M., Stockett M.H., Hervieux P.-A., Adoui L., Alcamí M., Huber B.A., Martín, Fernando, Cederquist H., Zettergren H., Rousseau P., Díaz-Tendero S., Departamento de Qímica, Módulo 13, Universidad Autónoma de Madrid, Departamento de Qímica, Department of Physics [Stockholm], Stockholm University, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), 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.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Abstract

International audience; We present experimental and theoretical results on single- and multiple-electron capture, and fragmentation, in C6+ + C-60 collisions at velocities in the v(col) = 0.05 - 0.4 a.u. range. We use time-of-flight mass spectrometry and coincidence detection of charged fragments to separate pure target ionization from processes in which the C-60 target is both ionized and fragmented. The coincidence technique allows us to identify different types of fragmentation processes such as C-60(q+) -> C-58(q+) + C-2 and C-60(q+) -> C-58((q-1)+) + C-2(+). A quasimolecular approach is employed to calculate charge transfer and target excitation cross sections. First-order time-dependent perturbation and statistical methods are used to treat the postcollisional processes: the calculated rate constants for C-2 and C-2(+) emission from the excited and charged fullerene are then used to evaluate the fragmentation dynamics. We show that the target ionization cross section decreases with the induced target charge state and the impact energy. C-2 emission from C-60(q+) is found to dominate when q = 5, in agreement with the present and previous experimental results.

Published
2014

42. Non-statistical fragmentation of PAHs and fullerenes in collisions with atoms

Author

Gatchell M., Stockett M.H., Rousseau P., Chen T., Kulyk K., Schmidt H.T., Chesnel J.Y., Domaracka A., Méry A., Maclot S., Adoui L., Støchkel K., Hvelplund P., Wang Y., Alcamí M., Huber B.A., Martín F., Zettergren H., Cederquist H. and This work was supported by the Swedish Research Council (Contract Nos. 621-2012-3662, 621-2012-3660, and 621-2011-4047). We acknowledge the COST action CM1204 'XUV/X-ray light and fast ions for ultrafast chemistry (XLIC)' and computer time from CCC UAM and BSC Mare Nostrum. Work partially supported by Project Nos. FIS2010-15127, CTQ2010-17006, CSD2007-00010 (MICINN), S2009/MAT1726 (CAM), and the CNRS PICS-05356.

Published
2014

45. Isomer effects in fragmentation of Polycyclic Aromatic Hydrocarbons

Author

Stockett, Mark H., Gatchell, Michael, de Ruette, Nathalie, Giacomozzi, Linda, Chen, Tao, Rousseau, P., Maclot, S., Chesnel, J. -Y., Adoui, L., Huber, B. A., Berzins, U., Schmidt, Henning T., Zettergren, Henning, Cederquist, Henrik, Stockett, Mark H., Gatchell, Michael, de Ruette, Nathalie, Giacomozzi, Linda, Chen, Tao, Rousseau, P., Maclot, S., Chesnel, J. -Y., Adoui, L., Huber, B. A., Berzins, U., Schmidt, Henning T., Zettergren, Henning, and Cederquist, Henrik

Abstract

We have observed significant differences in the fragmentation patterns of isomeric Polycyclic Aromatic Hydrocarbon (PAH) cations following collisions with helium atoms at center-of-mass energies around 100 eV. This is in contrast to the situation at other collision energies or in photo-absorption experiments where isomeric effects are very weak and where the lowest-energy dissociation channels (H- and C2H2-loss) domihate in statistical fragmentation processes. In the 100 eV range, non-statistical fragmentation also competes and is uniquely linked to losses of single carbon atoms (CHx-losses). We find that such CHx-losses are correlated with the ionic ground state energy within a given group of isomers. We present results for three C16H10+, four C18H12+ and five C20H12+ isomers colliding with He.

Published
2015
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46. Failure of hydrogenation in protecting polycyclic aromatic hydrocarbons from fragmentation

Author

Gatchell, Michael, Stockett, Mark H., de Ruette, Nathalie, Chen, Tao, Giacomozzi, Linda, Nascimento, Rodrigo F., Wolf, Michael, Anderson, Emma K., Delaunay, R., Vizcaino, V., Rousseau, P., Adoui, L., Huber, B. A., Schmidt, Henning T., Zettergren, Henning, Cederquist, Henrik, Gatchell, Michael, Stockett, Mark H., de Ruette, Nathalie, Chen, Tao, Giacomozzi, Linda, Nascimento, Rodrigo F., Wolf, Michael, Anderson, Emma K., Delaunay, R., Vizcaino, V., Rousseau, P., Adoui, L., Huber, B. A., Schmidt, Henning T., Zettergren, Henning, and Cederquist, Henrik

Abstract

A recent study of soft x-ray absorption in native and hydrogenated coronene cations, C24H12+m + m = 0-7, led to the conclusion that additional hydrogen atoms protect (interstellar) polycyclic aromatic hydrocarbon (PAH) molecules from fragmentation [Reitsma et al., Phys. Rev. Lett. 113, 053002 (2014)]. The present experiment with collisions between fast (30-200 eV) He atoms and pyrene (C16H10+m +, m = 0, 6, and 16) and simulations without reference to the excitation method suggests the opposite. We find that the absolute carbon-backbone fragmentation cross section does not decrease but increases with the degree of hydrogenation for pyrene molecules.

Published
2015
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48. Molecular dynamics studies of impulse driven reactions in molecules and molecular clusters

Author

Gatchell M., Delaunay R., Stockett M.H., Rousseau P., Domaracka A., Wang Y., Chen T., Adoui L., Alcamí M., Martín, Fernando, Schmidt H.T., Hubert B.A., Zettergren H., Cederquist H., Gatchell M., Delaunay R., Stockett M.H., Rousseau P., Domaracka A., Wang Y., Chen T., Adoui L., Alcamí M., Martín, Fernando, Schmidt H.T., Hubert B.A., Zettergren H., and Cederquist H.

Published
2015

49. Molecular growth inside of polycyclic aromatic hydrocarbon clusters induced by ion collisions

Author

Delaunay R., Gatchell M., Rousseau P., Domaracka A., Maclot S., Wang Y., Stockett M.H., Chen T., Adoui L., Alcamí M., Martín, Fernando, Zettergren H., Cederquist H., Huber B.A., Delaunay R., Gatchell M., Rousseau P., Domaracka A., Maclot S., Wang Y., Stockett M.H., Chen T., Adoui L., Alcamí M., Martín, Fernando, Zettergren H., Cederquist H., and Huber B.A.

Published
2015

50. N-Acetylglycine Cation Tautomerization Enabled by the Peptide Bond

Author

Kocisek J., Piekarski D.G., Delaunay R., Huber B.A., Adoui L., Martín, Fernando, Alcamí M., Rousseau P., Domaracka A., Kopyra J., Díaz-Tendero S., Kocisek J., Piekarski D.G., Delaunay R., Huber B.A., Adoui L., Martín, Fernando, Alcamí M., Rousseau P., Domaracka A., Kopyra J., and Díaz-Tendero S.

Published
2015

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