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61 results on '"Sylvie Sahal-Bréchot"'

1. Data on Stark Broadening of N VI Spectral Lines

Author: Milan S. Dimitrijević, Magdalena D. Christova, and Sylvie Sahal-Bréchot
Subjects: atomic data, Stark broadening, N VI, proton–boron fusion, line profiles, atomic processes, Bibliography. Library science. Information resources
Abstract: Data on Stark broadening parameters, spectral line widths, and shifts for 15 multiplets of N VI, whose spectral lines are broadened by collisions with electrons, protons, alpha particles (He III) and B III, B IV, B V and B VI ions, are presented. They have been calculated using the semiclassical perturbation theory, for temperatures from 50,000 K to 2,000,000 K, and perturber densities from 1016 cm−3 up to 1024 cm−3. The data for e, p and He III are of particular interest for the analysis and modelling of atmospheres of hot and dense stars, as, e.g., white dwarfs, and for investigation of their spectra, and data for boron ions are used for analysis and modelling of laser-driven plasma in proton–boron fusion research.
Published: 2024
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2. Stark Broadening of N VI Spectral Lines

Author: Milan S. Dimitrijević, Magdalena D. Christova, and Sylvie Sahal-Bréchot
Subjects: Stark broadening, N VI, proton-boron fusion, line profiles, atomic data, atomic processes, Elementary particle physics, QC793-793.5
Abstract: Stark broadening parameters, line widths and shifts, for 15 N VI multiplets are calculated using semiclassical perturbation theory for temperatures from 50,000 K to 2,000,000 K, and perturber density of 1016 cm−3. As perturbers have been taken electrons, protons and He III ions (alpha particles), which are of interest particularly for white dwarfs. Moreover, B III, B IV, B V and B VI ions have been taken as well, due to their significance for proton-boron fusion investigations. An example of the importance of Stark broadening in comparison with thermal Doppler broadening in atmospheres of spectral class DO white dwarfs is also presented. The obtained results are of interest particularly for white dwarf atmospheres modelling and analysis and synthesis of their spectra as well as for laser driven plasma in proton-boron fusion investigations.
Published: 2023
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3. The Semiclassical Limit of the Gailitis Formula Applied to Electron Impact Broadening of Spectral Lines of Ionized Atoms

Author: Sylvie Sahal-Bréchot
Subjects: feshbach resonances, electron collisions with ionized atoms, stark broadening, impact approximation, isolated lines, semiclassical-perturbation picture, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: The present paper revisits the determination of the semi-classical limit of the Feshbach resonances which play a role in electron impact broadening (the so-called “Stark“ broadening) of isolated spectral lines of ionized atoms. The Gailitis approximation will be used. A few examples of results will be provided, showing the importance of the role of the Feshbach resonances.
Published: 2021
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4. On the Stark Broadening of Be II Spectral Lines

Author: Milan S. Dimitrijević, Magdalena Christova, and Sylvie Sahal-Bréchot
Subjects: atomic data, atomic processes, line formation, Bibliography. Library science. Information resources
Abstract: Calculated Stark broadening parameters of singly ionized beryllium spectral lines have been reported. Three spectral series have been studied within semiclassical perturbation theory. The plasma conditions cover temperatures from 2500 to 50,000 K and perturber densities 1011 cm−3 and 1013 cm−3. The influence of the temperature and the role of the perturbers (electrons, protons and He+ ions) on the Stark width and shift have been discussed. Results could be useful for plasma diagnostics in astrophysics, laboratory, and industrial plasmas.
Published: 2020
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5. A Decade with VAMDC: Results and Ambitions

Author: Damien Albert, Bobby K. Antony, Yaye Awa Ba, Yuri L. Babikov, Philippe Bollard, Vincent Boudon, Franck Delahaye, Giulio Del Zanna, Milan S. Dimitrijević, Brian J. Drouin, Marie-Lise Dubernet, Felix Duensing, Masahiko Emoto, Christian P. Endres, Alexandr Z. Fazliev, Jean-Michel Glorian, Iouli E. Gordon, Pierre Gratier, Christian Hill, Darko Jevremović, Christine Joblin, Duck-Hee Kwon, Roman V. Kochanov, Erumathadathil Krishnakumar, Giuseppe Leto, Petr A. Loboda, Anastasiya A. Lukashevskaya, Oleg M. Lyulin, Bratislav P. Marinković, Andrew Markwick, Thomas Marquart, Nigel J. Mason, Claudio Mendoza, Tom J. Millar, Nicolas Moreau, Serguei V. Morozov, Thomas Möller, Holger S. P. Müller, Giacomo Mulas, Izumi Murakami, Yury Pakhomov, Patrick Palmeri, Julien Penguen, Valery I. Perevalov, Nikolai Piskunov, Johannes Postler, Alexei I. Privezentsev, Pascal Quinet, Yuri Ralchenko, Yong-Joo Rhee, Cyril Richard, Guy Rixon, Laurence S. Rothman, Evelyne Roueff, Tatiana Ryabchikova, Sylvie Sahal-Bréchot, Paul Scheier, Peter Schilke, Stephan Schlemmer, Ken W. Smith, Bernard Schmitt, Igor Yu. Skobelev, Vladimir A. Srecković, Eric Stempels, Serguey A. Tashkun, Jonathan Tennyson, Vladimir G. Tyuterev, Charlotte Vastel, Veljko Vujčić, Valentine Wakelam, Nicholas A. Walton, Claude Zeippen, and Carlo Maria Zwölf
Subjects: scientific databases, atomic and molecular data, interoperability, FAIR principles, open access, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: This paper presents an overview of the current status of the Virtual Atomic and Molecular Data Centre (VAMDC) e-infrastructure, including the current status of the VAMDC-connected (or to be connected) databases, updates on the latest technological development within the infrastructure and a presentation of some application tools that make use of the VAMDC e-infrastructure. We analyse the past 10 years of VAMDC development and operation, and assess their impact both on the field of atomic and molecular (A&M) physics itself and on heterogeneous data management in international cooperation. The highly sophisticated VAMDC infrastructure and the related databases developed over this long term make them a perfect resource of sustainable data for future applications in many fields of research. However, we also discuss the current limitations that prevent VAMDC from becoming the main publishing platform and the main source of A&M data for user communities, and present possible solutions under investigation by the consortium. Several user application examples are presented, illustrating the benefits of VAMDC in current research applications, which often need the A&M data from more than one database. Finally, we present our vision for the future of VAMDC.
Published: 2020
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6. The Spectroscopic Atomic and Molecular Databases at the Paris Observatory

Author: Evelyne Roueff, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Nicolas Moreau, and Hervé Abgrall
Subjects: atomic and molecular physics, stark broadening, UV spectra, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: This paper is intended to give a comprehensive overview of the current status and developments of the Paris Observatory STARK-B, MOLAT and SESAM databases which can be interrogated thanks to interoperability tools. The STARK-B database provides shifting and broadening parameters of different atomic and ionic transitions due to impacts with charged particles (the so-called Stark broadening) for different temperatures and densities. The spectroscopic MOLAT and SESAM databases provide the wavelengths, the oscillator strengths or Einstein spontaneous emission coefficients of H 2 , CO and isotopologues molecules.
Published: 2020
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7. On the Application of Stark Broadening Data Determined with a Semiclassical Perturbation Approach

Author: Milan S. Dimitrijević and Sylvie Sahal-Bréchot
Subjects: Stark broadening, isolated lines, impact approximation, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: The significance of Stark broadening data for problems in astrophysics, physics, as well as for technological plasmas is discussed and applications of Stark broadening parameters calculated using a semiclassical perturbation method are analyzed.
Published: 2014
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8. Widths and Shifts of Isolated Lines of Neutral and Ionized Atoms Perturbed by Collisions With Electrons and Ions: An Outline of the Semiclassical Perturbation (SCP) Method and of the Approximations Used for the Calculations

Author: Sylvie Sahal-Bréchot, Milan S. Dimitrijević, and Nabil Ben Nessib
Subjects: Stark broadening, impact approximation, isolated lines, semiclassical perturbation picture, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: “Stark broadening” theory and calculations have been extensively developed for about 50 years. The theory can now be considered as mature for many applications, especially for accurate spectroscopic diagnostics and modeling, in astrophysics, laboratory plasma physics and technological plasmas, as well. This requires the knowledge of numerous collisional line profiles. In order to meet these needs, the “SCP” (semiclassical perturbation) method and numerical code were created and developed. The SCP code is now extensively used for the needs of spectroscopic diagnostics and modeling, and the results of the published calculations are displayed in the STARK-B database. The aim of the present paper is to introduce the main approximations leading to the impact of semiclassical perturbation method and to give formulae entering the numerical SCP code, in order to understand the validity conditions of the method and of the results; and also to understand some regularities and systematic trends. This would also allow one to compare the method and its results to those of other methods and codes. 1
Published: 2014
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9. Stark Broadening of Neutral Boron Lines

Author: Magdalena Christova, Milan S. Dimitrijević, and Sylvie Sahal-Bréchot
Subjects: atomic data, atomic processes, line formation, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Stark broadening parameters, width and shift, of lines within B I 2s22p−2s2ns spectral series have been calculated. Semi-classical theory in impact approximation has been applied. Temperature dependence of Stark parameters has been studied. The presented results could be applied for plasma diagnostics.
Published: 2019
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10. The Third and Fourth Workshops on Spectral Line Shapes in Plasma Code Comparison: Isolated Lines

Author: Sylvie Sahal-Bréchot, Evgeny Stambulchik, Milan S. Dimitrijević, Spiros Alexiou, Bin Duan, and Véronique Bommier
Subjects: spectral line shapes, Stark broadening, cross-sections, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: The purpose of the Spectral Line Shapes in Plasmas (SLSP) code comparison workshop is to compare different computational and analytical methods, in order to pinpoint sources of disagreements, infer limits of applicability, and assess accuracy. The present paper reviews a part of the results of the third (2015) and fourth (2017) workshops related to isolated lines.
Published: 2018
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11. Quantum and Semiclassical Stark Widths for Ar VII Spectral Lines

Author: Rihab Aloui, Haykel Elabidi, Sylvie Sahal-Bréchot, and Milan S. Dimitrijević
Subjects: Stark broadening, Ar VII line profiles, stars, white dwarfs, atomic data, scattering, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: We present in this paper the results of a theoretical study of electron impact broadening for several lines of the Ar VII ion. The results have been obtained using our quantum mechanical method and the semiclassical perturbation one. Results are presented for electron density 1018 cm−3 and for electron temperatures ranging from 2 × 10 4 to 5 × 10 5 K required for plasma modeling. Our results have been compared to other semiclassical ones obtained using different sources of atomic data. A study of the strong collisions contributions to line broadening has been performed. The atomic structure and collision data used for the calculations of line broadening are also calculated by our codes and compared to available theoretical results. The agreement found between the two calculations ensures that our line broadening procedure uses adequate structure and collision data.
Published: 2018
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12. Semiclassical Stark Broadening Parameters of Ar VII Spectral Lines

Author: Milan S. Dimitrijević, Aleksandar Valjarević, and Sylvie Sahal-Bréchot
Subjects: stark broadening, atomic data, atomic processes, line profiles, Ar VII, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Using the semi-classical perturbation approach in the impact approximation, full width at half maximum and shift have been determined for eight spectral lines of Ar VII, for broadening by electron-, proton-, and He III-impacts. The results are provided for temperatures from 20,000 K to 500,000 K, and for an electron density of 10 18 cm − 3 . The obtained results will be included in the STARK-B database, which is also in the virtual atomic and molecular data center (VAMDC).
Published: 2017
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13. Stark broadening of Zn II spectral lines

Author: Sylvie Sahal-Bréchot, Nenad Milovanović, Milan S. Dimitrijević, Magdalena Christova, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)
Subjects: Physics, [PHYS]Physics [physics], atomic processes, Astronomy and Astrophysics, 01 natural sciences, Spectral line, symbols.namesake, Stark effect, Space and Planetary Science, 0103 physical sciences, symbols, Physics::Atomic and Molecular Clusters, atomic data, Physics::Atomic Physics, line: formation, Atomic physics, 010306 general physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Atomic data
Abstract: Stark broadening parameters, full widths at half intensity maximum, and shifts for 34 multiplets of singly charged zinc ion have been calculated using the impact semiclassical perturbation formalism. Stark broadening parameters due to collisions with electrons, protons, and helium ions have been obtained for a grid of electron densities and temperatures. The obtained results have been used to demonstrate the influence of Stark broadening mechanism on spectral lines of Zn II in stellar atmospheres.
Published: 2021
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14. A Decade with VAMDC: Results and Ambitions

Author: Carlo Maria Zwölf, A. J. Markwick, Anastasiya A. Lukashevskaya, Tom J. Millar, Patrick Palmeri, M. Emoto, Yuri Ralchenko, Thomas Marquart, Felix Duensing, Evelyne Roueff, Duck-Hee Kwon, Pascal Quinet, Johannes Postler, Julien Penguen, Izumi Murakami, Vincent Boudon, Bobby Antony, Paul Scheier, Milan S. Dimitrijević, Christine Joblin, Valery I. Perevalov, Vladimir G. Tyuterev, Jean-Michel Glorian, Tatiana Ryabchikova, Valentine Wakelam, E. Krishnakumar, Igor Y.-U. Skobelev, Philippe Bollard, Guy Rixon, Laurence S. Rothman, Sylvie Sahal-Bréchot, Giacomo Mulas, Damien Albert, Nicolas Moreau, Bernard Schmitt, Alexandr Z. Fazliev, Peter Schilke, Giulio Del Zanna, Stephan Schlemmer, Eric Stempels, Nicholas A. Walton, Bratislav P. Marinković, Serguey A. Tashkun, Charlotte Vastel, Yury Pakhomov, Claudio Mendoza, K. W. Smith, Thomas Möller, Oleg M. Lyulin, Brian J. Drouin, Roman V. Kochanov, Alexei I. Privezentsev, Vladimir A. Srećković, Darko Jevremović, Giuseppe Leto, Iouli E. Gordon, Serguei V. Morozov, Nigel J. Mason, C. J. Zeippen, Yong-Joo Rhee, Petr A. Loboda, Veljko Vujčić, Pierre Gratier, Jonathan Tennyson, Marie-Lise Dubernet, Cyril Richard, Franck Delahaye, Christian Hill, Yuri L. Babikov, Christian P. Endres, Holger S. P. Müller, Nikolai Piskunov, Yaye Awa Ba, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), 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), Department of Environmental, Earth, and Atmospheric Sciences [Lowell], University of Massachusetts [Lowell] (UMass Lowell), University of Massachusetts System (UMASS)-University of Massachusetts System (UMASS), Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS), FORMATION STELLAIRE 2020, Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), LERMA Cergy (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, INAF - Osservatorio Astronomico di Cagliari (OAC), Istituto Nazionale di Astrofisica (INAF), Del Zanna, Giulio [0000-0002-4125-0204], Walton, Nicholas [0000-0003-3983-8778], Apollo - University of Cambridge Repository, 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, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL)
Subjects: Nuclear and High Energy Physics, 010504 meteorology & atmospheric sciences, Data management, Atom and Molecular Physics and Optics, Interoperability, interoperability, 01 natural sciences, Field (computer science), Resource (project management), 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, open access, [PHYS]Physics [physics], atomic and molecular data, scientific databases, FAIR principles, business.industry, Condensed Matter Physics, Data science, Atomic and Molecular Physics, and Optics, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, lcsh:QC770-798, Data center, Atom- och molekylfysik och optik, business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: This paper presents an overview of the current status of the Virtual Atomic and Molecular Data Centre (VAMDC) e-infrastructure, including the current status of the VAMDC-connected (or to be connected) databases, updates on the latest technological development within the infrastructure and a presentation of some application tools that make use of the VAMDC e-infrastructure. We analyse the past 10 years of VAMDC development and operation, and assess their impact both on the field of atomic and molecular (A&amp, M) physics itself and on heterogeneous data management in international cooperation. The highly sophisticated VAMDC infrastructure and the related databases developed over this long term make them a perfect resource of sustainable data for future applications in many fields of research. However, we also discuss the current limitations that prevent VAMDC from becoming the main publishing platform and the main source of A&amp, M data for user communities, and present possible solutions under investigation by the consortium. Several user application examples are presented, illustrating the benefits of VAMDC in current research applications, which often need the A&amp, M data from more than one database. Finally, we present our vision for the future of VAMDC.
Published: 2020
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15. Semiclassical perturbation Stark shifts of singly charged argon spectral lines

Author: Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Rafik Hamdi, Nabil Ben Nessib, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Faculté des Sciences de Bizerte [Université de Carthage], Université de Carthage - University of Carthage, and King Saud University [Riyadh] (KSU)
Subjects: atomic processes, chemistry.chemical_element, Perturbation (astronomy), Semiclassical physics, 7. Clean energy, 01 natural sciences, Spectral line, 0103 physical sciences, Physics::Atomic and Molecular Clusters, atomic data, Physics::Chemical Physics, 010306 general physics, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], Argon, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astronomy and Astrophysics, chemistry, Space and Planetary Science, line: formation, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Atomic data
Abstract: Using semiclassical perturbation approach in impact approximation, Stark shifts for singly charged argon (Ar ii) spectral lines have been calculated. Energy levels and oscillator strengths needed for this calculation were determined using Hartree–Fock method with relativistic correction (HFR). We compare our results with experimental values for 100 spectral lines. We also present results as a function of temperature for 161 spectral lines for collisions with electrons, protons, singly charged helium and singly charged argon. This work extends our previous one.
Published: 2019
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16. Quantum mechanical Stark widths for Ar v and Ar vi lines: scaling with temperature

Author: Sylvie Sahal-Bréchot, Haykel Elabidi, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Subjects: Physics, [PHYS]Physics [physics], Scattering, White dwarf, Astronomy and Astrophysics, 01 natural sciences, Space and Planetary Science, 0103 physical sciences, Atomic physics, 010306 general physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Quantum, Scaling, ComputingMilieux_MISCELLANEOUS, Atomic data
Abstract: International audience
Published: 2018
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17. The Third and Fourth Workshops on Spectral Line Shapes in Plasma Code Comparison: Isolated Lines

Author: Milan S. Dimitrijević, Bin Duan, Sylvie Sahal-Bréchot, Véronique Bommier, Evgeny Stambulchik, S. Alexiou, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Plasma Laboratory, Weizmann Institute of Science [Rehovot, Israël], Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), TETY, University of Crete [Heraklion] (UOC), Institute of Applied Physics and Computational Mathematics [Beijing] (IAPCM), Chinese Academy of Sciences [Beijing] (CAS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Programme National de Physique Stellaire' (PNPS) of CNRS/INSU, and ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011)
Subjects: Physics, [PHYS]Physics [physics], Nuclear and High Energy Physics, 010504 meteorology & atmospheric sciences, Stark broadening, Plasma, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Spectral line, Computational physics, symbols.namesake, Stark effect, Order (business), 0103 physical sciences, symbols, Code (cryptography), lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, spectral line shapes, 010306 general physics, cross-sections, 0105 earth and related environmental sciences
Abstract: International audience; The purpose of the Spectral Line Shapes in Plasmas (SLSP) code comparison workshop is to compare different computational and analytical methods, in order to pinpoint sources of disagreements, infer limits of applicability, and assess accuracy. The present paper reviews a part of the results of the third (2015) and fourth (2017) workshops related to isolated lines.
Published: 2018
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18. Quantum and Semiclassical Stark Widths for Ar VII Spectral Lines

Author: Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Rihab Aloui, and Haykel Elabidi
Subjects: stars, Nuclear and High Energy Physics, Electron density, 010504 meteorology & atmospheric sciences, Stark broadening, Semiclassical physics, Electron, 01 natural sciences, Spectral line, Ion, symbols.namesake, Ar VII line profiles, 0103 physical sciences, atomic data, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010303 astronomy & astrophysics, Electron ionization, 0105 earth and related environmental sciences, white dwarfs, Physics, scattering, Condensed Matter Physics, Plasma modeling, Atomic and Molecular Physics, and Optics, Stark effect, symbols, lcsh:QC770-798, Atomic physics
Abstract: We present in this paper the results of a theoretical study of electron impact broadening for several lines of the Ar VII ion. The results have been obtained using our quantum mechanical method and the semiclassical perturbation one. Results are presented for electron density 1018 cm−3 and for electron temperatures ranging from 2 × 10 4 to 5 × 10 5 K required for plasma modeling. Our results have been compared to other semiclassical ones obtained using different sources of atomic data. A study of the strong collisions contributions to line broadening has been performed. The atomic structure and collision data used for the calculations of line broadening are also calculated by our codes and compared to available theoretical results. The agreement found between the two calculations ensures that our line broadening procedure uses adequate structure and collision data.
Published: 2018

19. Semiclassical perturbation Stark widths of singly charged argon spectral lines

Author: Rafik Hamdi, Nabil Ben Nessib, Sylvie Sahal-Bréchot, Milan S Dimitrijević, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Subjects: [PHYS]Physics [physics], Space and Planetary Science, 0103 physical sciences, Astronomy and Astrophysics, 010306 general physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, 01 natural sciences, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2018
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20. Stark Widths of Ar II Spectral Lines in the Atmospheres of Subdwarf B Stars

Author: Sylvie Sahal Bréchot, Nabil Ben Nessib, Milan S. Dimitrijević, Rafik Hamdi, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), and Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, 010504 meteorology & atmospheric sciences, stark broadening, atomic data, subdwarfs B stars, Ar II, Semiclassical physics, Astrophysics, 01 natural sciences, Spectral line, symbols.namesake, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Physics, Stellar atmosphere, Plasma, Condensed Matter Physics, Subdwarf, Atomic and Molecular Physics, and Optics, Stars, Stark effect, symbols, lcsh:QC770-798, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Atomic data
Abstract: Stark broadening parameters are of interest for many problems in astrophysics and laboratory plasmas investigation. Ar II spectral lines are observed in many kinds of stellar atmospheres such as the atmospheres of B-Type stars and subdwarf B stars. In this work, we present theoretical Stark widths for Ar II spectral lines. We use the impact semiclassical perturbation approach. Our results are compared with the available experimental values. Finally, the importance of the Stark broadening mechanism is studied in atmospheric conditions of subdwarf B stars.
Published: 2017
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21. Semiclassical Stark Broadening Parameters of Ar VII Spectral Lines

Author: Aleksandar Valjarević, Sylvie Sahal-Bréchot, and Milan S. Dimitrijević
Subjects: Nuclear and High Energy Physics, Electron density, 010504 meteorology & atmospheric sciences, atomic processes, Semiclassical physics, Perturbation (astronomy), Electron, stark broadening, atomic data, line profiles, Ar VII, 7. Clean energy, 01 natural sciences, Spectral line, symbols.namesake, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Physics, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Full width at half maximum, Stark effect, symbols, lcsh:QC770-798, Atomic physics, Homogeneous broadening
Abstract: Using the semi-classical perturbation approach in the impact approximation, full width at half maximum and shift have been determined for eight spectral lines of Ar VII, for broadening by electron-, proton-, and He III-impacts. The results are provided for temperatures from 20,000 K to 500,000 K, and for an electron density of 10 18 cm − 3 . The obtained results will be included in the STARK-B database, which is also in the virtual atomic and molecular data center (VAMDC).
Published: 2017
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22. On the stark broadening of Ar VII spectral lines

Author: Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), and Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Stark broadening, atomic processes, 01 natural sciences, 7. Clean energy, Spectral line, symbols.namesake, Stark effect, 0103 physical sciences, symbols, atomic data, lcsh:Q, Atomic physics, lcsh:Science, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010306 general physics, line profiles, 010303 astronomy & astrophysics
Abstract: Stark broadening parameters, full width at half maximum of spectral line and shift, have been calculated for 3 spectral lines of Ar VII, for broadening by electron, proton, and He III impacts. For calculations, the semiclassical perturbation approach in the impact approximation has been used. The results are provided for temperatures from 20 000 K to 500 000 K and for an electron density of 1017 cm-3. Obtained results will be included in the STARK-B database which is also included in Virtual atomic and molecular data center (VAMDC).
Published: 2017
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23. Stark broadening of B IV spectral lines

Author: Andjelka Kovačević, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Magdalena Christova, Zoran Simić, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Astronomical Observatory Belgrade (AOB), Department of Astronomy, and École normale supérieure - Paris (ENS Paris)
Subjects: Semiclassical physics, chemistry.chemical_element, FOS: Physical sciences, 01 natural sciences, Spectral line, Physics::Geophysics, symbols.namesake, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, 010303 astronomy & astrophysics, Helium, ComputingMilieux_MISCELLANEOUS, Solar and Stellar Astrophysics (astro-ph.SR), Physics, [PHYS]Physics [physics], White dwarf, Astronomy and Astrophysics, Formalism (philosophy of mathematics), Stark effect, chemistry, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, symbols, Atomic physics, Homogeneous broadening, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Hydrogen spectral series
Abstract: Stark broadening parameters for 157 multiplets of helium like boron (B IV) have been calculated using the impact semiclassical perturbation formalism. Obtained results have been used to investigate the regularities within spectral series. An example of the influence of Stark broadening on B IV lines in DO white dwarfs is given., 6 pages, 2 figures
Published: 2016
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24. The virtual atomic and molecular data centre (VAMDC) consortium

Author: J. de Urquijo, Fabien Daniel, E. Roueff, V.I. Perevalov, Sergey Pancheshnyi, E. Krishnakumar, Bernard Schmitt, A. J. Markwick, Guy Rixon, Sylvain Maclot, Pascal Quinet, Iouli E. Gordon, G. Del Zanna, Brian J. Drouin, Christian P. Endres, Stephan Schlemmer, Bobby Antony, Paul Scheier, Milan S. Dimitrijević, Yu. Ralchenko, Oleg Zatsarinny, Thierry Louge, Alicja Domaracka, N. Moreau, M. L. Dubernet, Veljko Vujčić, Yu. V. Pakhomov, Tom J. Millar, Pierre Gratier, Tatiana Ryabchikova, Hyun-Kyung Chung, A. Kasprzak, Helen E. Mason, Yu L. Babikov, Patrick Palmeri, Vl.G. Tyuterev, Ernesto Quintas-Sánchez, Giuseppe Leto, C. Joblin, Vincent Boudon, Alexander Fazliev, Christian Hill, Nigel J. Mason, C. J. Zeippen, D. Jevremović, Ulrike Heiter, Valentine Wakelam, S.A. Tashkun, Laurence S. Rothman, Giacomo Mulas, Nikolai Piskunov, P. A. Loboda, Anatolij A. Mihajlov, Jonathan Tennyson, N. A. Walton, Klaus Bartschat, Franck Delahaye, Johannes Postler, S. V. Gagarin, Y. J. Rhee, Claudio Mendoza, Carlo Maria Zwölf, M. Doronin, Sylvie Sahal-Bréchot, T. Marquart, Bastiaan J. Braams, Yaye Awa Ba, Bratislav P. Marinković, E. Stempels, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Universidade Católica de Brasília=Catholic University of Brasília (UCB), Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-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), Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), California Institute of Technology (CALTECH), I. Physikalisches Institut [Köln], Universität zu Köln = University of Cologne, IMEC (IMEC), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), AMOR 2016, Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Uppsala University, British Antarctic Survey (BAS), Natural Environment Research Council (NERC), Fruit Research Institute, General Directorate of Agricultural Research and Policies (TAGEM), Centre d'étude spatiale des rayonnements (CESR), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astrofisico di Catania (OACT), Istituto Nazionale di Astrofisica (INAF), Institut de recherche en astrophysique et planétologie (IRAP), Department of Astronomy and Space Physics [Uppsala], Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, Wilberforce Road, The Open University [Milton Keynes] (OU), Laboratoire des Matériaux et Procédés Actifs (LMPA), Département de recherche sur les Procédés et Matériaux pour les Environnements complexes (DPME), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), École polytechnique (X), INAF - Osservatorio Astronomico di Cagliari (OAC), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Laboratory of Theoretical Spectroscopy [Tomsk] (LTS), V.E. Zuev Institute of Atmospheric Optics (IAO), Siberian Branch of the Russian Academy of Sciences (SB RAS)-Siberian Branch of the Russian Academy of Sciences (SB RAS), Department of Physics and Astronomy [Uppsala], IPNAS, Université de Liège, Institute of Astronomy [Cambridge], University of Cambridge [UK] (CAM), Institute of Astronomy of the Russian Academy of Sciences (INASAN), Russian Academy of Sciences [Moscow] (RAS), Institut für Ionenphysik und Angewandte Physik - Institute for Ion Physics and Applied Physics [Innsbruck], Leopold Franzens Universität Innsbruck - University of Innsbruck, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), 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)-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, Department of Physics and Astronomy [UCL London], University College of London [London] (UCL), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-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 Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), ITA, USA, GBR, FRA, DEU, ESP, École normale supérieure - Paris (ENS Paris), Universidade Católica de Brasília (UCB), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Universität zu Köln, Univ Toulouse UPS, Ctr Etud Spatiale Rayonnements, F-31062 Toulouse 9, France, Centre Etud Spatiale Rayonnements Toulouse, Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Département de recherche sur les technologies pour l'enrichissement, le démantèlement et les déchets (DE2D), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées
Subjects: spectroscopy, 010504 meteorology & atmospheric sciences, databases, астрофизика, спектроскопия, Atom and Molecular Physics and Optics, Nanotechnology, 01 natural sciences, World Wide Web, 0103 physical sciences, molecules, kinetic data, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, кинетические данные, 0105 earth and related environmental sciences, Physics, [PHYS]Physics [physics], atoms, astrophysics, business.industry, базы ядерных данных, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Molecular Databases, Data center, Atom- och molekylfysik och optik, Astronomical spectra, business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: The Virtual Atomic and Molecular Data Centre (VAMDC) Consortium is a worldwide consortium which federates atomic and molecular databases through an e-science infrastructure and an organisation to support this activity. About 90% of the inter-connected databases handle data that are used for the interpretation of astronomical spectra and for modelling in many fields of astrophysics. Recently the VAMDC Consortium has connected databases from the radiation damage and the plasma communities, as well as promoting the publication of data from Indian institutes. This paper describes how the VAMDC Consortium is organised for the optimal distribution of atomic and molecular data for scientific research. It is noted that the VAMDC Consortium strongly advocates that authors of research papers using data cite the original experimental and theoretical papers as well as the relevant databases.
Published: 2016
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25. Stark Broadening Parameters for Neutral Oxygen Spectral Lines

Author: Norah Alonizan, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Rabia Qindeel, N. Ben Nessib, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS Paris)
Subjects: Physics, [PHYS]Physics [physics], Electron density, Proton, Astronomy and Astrophysics, Plasma, Electron, Spectral line, Ion, symbols.namesake, Stark effect, Space and Planetary Science, symbols, Physics::Atomic Physics, Atomic physics, Homogeneous broadening, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ComputingMilieux_MISCELLANEOUS
Abstract: Stark broadening parameters for nine neutral oxygen (O I) lines have been determined within the impact approximation and the semiclassical perturbation method. The atomic data have been taken from the TOPbase and NIST atomic databases. The electron and proton Stark widths and shifts and ion broadening parameter values for these O I lines have been calculated for electron density of 10 16 cm −3 and for 4 different electron temperatures in the range of 5000 K to 40000 K. These Stark broadening parameters are compared with our previous results (Ben Nessib, N. et al. 1996, Physica Scripta, 54, 603–613), where we calculated Stark broadening parameters for only four O I spectral lines and where Stark widths and shifts were compared with experimental and theoretical data available in the literature. In the present paper, we have also compared our results with the Griem’s book (Griem, H. R. 1974, Spectral line broadening by plasmas) and VALD (Ryabchikova, T. et al. 2015, Physica Scripta, 90, 054005) values.
Published: 2015
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26. Stark Widths of Spectral Lines of Neutral Neon

Author: Andjelka Kovačević, Aleksandar Valjarević, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Zoran Simić, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Astronomical Observatory Belgrade (AOB), Department of Astronomy, Department of Geography, and École normale supérieure - Paris (ENS-PSL)
Subjects: Stark broadening, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Spectral line, symbols.namesake, Neon, Ionization, 0103 physical sciences, atomic data, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], Argon, Astronomy and Astrophysics, Stark effect, chemistry, Space and Planetary Science, symbols, Plasma diagnostics, Atomic physics, Homogeneous broadening, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], line profiles [Ne I], Doppler broadening
Abstract: In order to complete Stark broadening data for Ne I spectral lines which are needed for analysis of stellar atmospheres, collisional widths and shifts (the so-called Stark broadening parameters) of 29 isolated spectral lines of neutral neon have been determined within the impact semiclassical perturbation method. Calculations have been performed for the broadening by collisions with electrons, protons and ionized helium for astrophysical applications, and for collisions with ionized neon and argon for laboratory plasma diagnostics. The shifts have been compared with existing experimental values. The obtained data will be included in the STARK-B database, which is a part of the Virtual Atomic and Molecular Data Center - VAMDC.
Published: 2015
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27. Stark broadening of Xe viii spectral lines

Author: Andjelka Kovačević, Aleksandar Valjarević, Zoran Simić, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Astronomical Observatory Belgrade (AOB), Department of Astronomy, Department of Geography, and École normale supérieure - Paris (ENS-PSL)
Subjects: Physics, [PHYS]Physics [physics], atomic processes, Astronomy and Astrophysics, 01 natural sciences, Spectral line, formation [line], symbols.namesake, Stark effect, Space and Planetary Science, 0103 physical sciences, symbols, atomic data, Astrophysics::Solar and Stellar Astrophysics, Atomic physics, 010306 general physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Atomic data, Doppler broadening
Abstract: Stark broadening parameters have been calculated for 60 spectral lines of Xe VIII, for broadening by electron, proton, and He III impacts. For calculations, the semiclassical perturbation approach in the impact approximation has been used. The widths and shifts are provided for temperatures from 20 000 K to 500 000 K and for an electron density of 10(17) cm(-3). Obtained results have been used to study the influence of Stark broadening on spectral lines in DO white dwarf atmospheres and it has been found that exist broad layers where this broadening mechanism is dominant in comparison with thermal Doppler broadening.
Published: 2015
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28. The STARK-B database VAMDC node: a repository for spectral line broadening and shifts due to collisions with charged particles

Author: Sylvie Sahal-Bréchot, N. Ben Nessib, Milan S. Dimitrijević, Nicolas Moreau, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), École polytechnique (X), and École normale supérieure - Paris (ENS-PSL)
Subjects: Physics, [PHYS]Physics [physics], Database, Online database, Virtual observatory, Condensed Matter Physics, computer.software_genre, Atomic and Molecular Physics, and Optics, Charged particle, Spectral line, Observatory, Ionization, Atom, Physics::Atomic Physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], computer, Mathematical Physics, ComputingMilieux_MISCELLANEOUS, Line (formation)
Abstract: Accurate spectroscopic diagnostics and modeling require the knowledge of numerous collisional line profiles. Access to such data via an online database has become indispensable. The STARK-B database is aimed at meeting these needs for widths and shifts of isolated lines of neutral and ionized elements due to electron and ion impacts. This database of the Paris Observatory is a result of scientific cooperation between S Sahal-Brechot (LERMA) and M S Dimitrijevic (AOB). Access to it is free, and it was opened online at the end of 2008. STARK-B is a node of the Virtual Atomic and Molecular Data Centre (VAMDC) and thus complies with VAMDC and Virtual Observatory standards. VAMDC is a European Union-funded collaboration among groups involved in the generation and use of interoperable atomic and molecular data. STARK-B now contains all our semiclassical-perturbation (SCP) calculated data for more than 123 neutral or ionized elements as published in international refereed journals. It is devoted to modeling and spectroscopic diagnostics of stellar atmospheres and envelopes, laboratory plasmas, laser equipment, and technological plasmas. Hence, the range of temperatures and densities covered by the tables is broad and depends on the ionization degree of the radiating atom. The modified semiempirical (MSE) results of calculations have begun to be implemented. In this paper, we highlight the key points of the method and the assumptions used in the calculations, which have lately been revisited. Then we present the database and its recent developments, as well as our ongoing work and our plans for the future.
Published: 2015
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29. Stark Broadening in Compact Stars: Xe VI Lines

Author: Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Andjelka Kovačević, Zoran Simić, Aleksandar Valjarević, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Astronomical Observatory Belgrade (AOB), Department of Astronomy, Department of Geography, and École normale supérieure - Paris (ENS Paris)
Subjects: Stark broadening, Semiclassical physics, Xe VI, Astrophysics, 01 natural sciences, Spectral line, 010309 optics, symbols.namesake, 0103 physical sciences, atomic data, Astrophysics::Solar and Stellar Astrophysics, Physics::Atomic Physics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, white dwarfs, Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], White dwarf, Astronomy and Astrophysics, Stars, Stark effect, Space and Planetary Science, symbols, Astrophysics::Earth and Planetary Astrophysics, Atomic physics, Homogeneous broadening, Atomic data
Abstract: International audience; We will consider Stark broadening of non hydrogenic spectral lines in the impact approximation in compact stars: pre-white dwarf and white dwarf atmospheres. In order to show an example, Stark broadening parameters have been calculated, using the impact semiclassical perturbation approach for four Xe VI spectral lines. Obtained results have been used to demonstrate the influence of Stark broadening in DA and DB white dwarf atmospheres.
Published: 2015
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30. Collisional line broadening versus collisional depolarization: Similarities and differences

Author: V. Bommier, Sylvie Sahal-Bréchot, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université de Cergy Pontoise (UCP), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Atmospheric Science, Population, Aerospace Engineering, 01 natural sciences, symbols.namesake, 0103 physical sciences, Radiative transition, 010306 general physics, education, 010303 astronomy & astrophysics, Hyperfine structure, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], education.field_of_study, Zeeman effect, Astronomy and Astrophysics, Depolarization, Polarization (waves), [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], Elastic collision, Geophysics, Space and Planetary Science, symbols, General Earth and Planetary Sciences, Atomic physics, Homogeneous broadening, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: International audience; Within the impact approximation, collisional line broadening parameters and depolarizing and polarization transfer (population, orientation, alignment transfer) rates are complementary: both include the effect of collisional transitions between the Zeeman sublevels of a given level, or between fine or hyperfine structure levels of a given term. However, there are several differences: in line broadening, the two levels connected by the radiative transition contribute to the broadening, and there is also an interference term between these two levels, whereas only one level or two close levels are concerned in the depolarization. Another difference lies in the fact that purely elastic collisions contribute also to the line broadening, whereas they do not contribute to the depolarization. The nature of these two kinds of coefficients are recalled. Then the possibility to find some relationships or systematic trends concerning depolarization versus collisional broadening is considered. This is to answer some current questions which come from the polarization community.
Published: 2014
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31. The STARK-B database as a resource for 'STARK' widths and shifts data: State of advancement and program of development

Author: Milan S. Dimitrijević, Nicolas Moreau, Nabil Ben Nessib, Sylvie Sahal-Bréchot, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS-PSL)
Subjects: Atmospheric Science, 010504 meteorology & atmospheric sciences, Aerospace Engineering, Context (language use), computer.software_genre, 01 natural sciences, Resource (project management), Observatory, Ionization, 0103 physical sciences, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Physics, [PHYS]Physics [physics], Database, business.industry, Online database, Stellar atmosphere, Astronomy and Astrophysics, Geophysics, Space and Planetary Science, General Earth and Planetary Sciences, Data center, State (computer science), business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], computer
Abstract: “Stark” broadening theories and calculations have been extensively developed for about 50 years and can now be applied to many needs, especially for accurate spectroscopic diagnostics and modeling. This requires the knowledge of numerous collisional line profiles. Nowadays, the access to such data via an online database becomes essential. STARK-B is a collaborative project between the Astronomical Observatory of Belgrade and the Laboratoire d’Etude du Rayonnement et de la matiere en Astrophysique (LERMA). It is a database of calculated widths and shifts of isolated lines of atoms and ions due to electron and ion collisions (impacts). It is devoted to modeling and spectroscopic diagnostics of stellar atmospheres and envelopes, laboratory plasmas, laser equipments and technological plasmas. Hence, the domain of temperatures and densities covered by the tables is wide and depends on the ionization degree of the considered ion. STARK-B has been fully opened since September 2008 and is in free access. The first stage of development was ended in autumn 2012, since all the existing data calculated with the impact semiclassical-perturbation method and code by Sahal-Brechot, Dimitrijevic and coworkers have now been implemented. We are now beginning the second stage of the development of STARK-B. The state of advancement of the database and our program of development are presented here, together with its context within VAMDC. VAMDC (Virtual Atomic and Molecular Data Center) is an international consortium which has built a secure, documented, flexible interoperable platform e-science permitting an automated exchange of atomic and molecular data.
Published: 2014
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32. Quantum Stark broadening of Ar XV lines. Strong collision and quadrupolar potential contributions

Author: Milan S. Dimitrijević, Sylvie Sahal-Bréchot, Haykel Elabidi, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, Université Paris sciences et lettres (PSL), and École normale supérieure - Paris (ENS-PSL)
Subjects: Atmospheric Science, Atomic Physics (physics.atom-ph), Aerospace Engineering, Semiclassical physics, FOS: Physical sciences, line profiles, stars atmospheres, white dwarfs, quantum formalism, 01 natural sciences, 7. Clean energy, Spectral line, Physics - Atomic Physics, symbols.namesake, 0103 physical sciences, 010306 general physics, 010303 astronomy & astrophysics, Quantum, Electron ionization, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], White dwarf, Astronomy and Astrophysics, Stars, Geophysics, Stark effect, Space and Planetary Science, Excited state, symbols, General Earth and Planetary Sciences, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: We present in this paper electron impact broadening for six Ar XV lines using our quantum mechanical formalism and the semiclassical perturbation one. Additionally, our calculations of the corresponding atomic structure data (energy levels and oscillator strengths) and collision strengths are given as well. The lines considered here are divided into two sets: a first set of four lines involving the ground level: 1s$^{2}2$s$^{2}$ $^{1}$S$_{0}-$1s$^{2}2$s$n$p $^{1}$P$^{\rm o}_{1}$ where $2\leq n \leq5$ and a second set of two lines involving excited levels: 1s$^{2}2$s2p $^{1}$P$^{\rm o}_{1}-$1s$^{2}2$s3s $^{1}$S$_{0}$ and 1s$^{2}2$s2p $^{3}$P$^{\rm o}_{0}-$1s$^{2}2$s3s $^{3}$S$_{1}$. An extensive comparison between the quantum and the semiclassical results was performed in order to analyze the reason for differences between quantum and semiclassical results up to the factor of two. It has been shown that the difference between the two results may be due to the evaluation of strong collision contributions by the semiclassical formalism. Except few semiclassical results, the present results are the first to be published. After the recent discovery of the far UV lines of Ar VII in the spectra of very hot central stars of planetary nebulae and white dwarfs, the present -and may be further- results can be used also for the corresponding future spectral analysis., 8 pages
Published: 2014
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33. The OIV 1407.3Å /1401.1Å emission-line ratio in a plasma

Author: Milan S. Dimitrijević, Norah Alonizan, Nabil Ben Nessib, Rabia Qindeel, Sylvie Sahal-Bréchot, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS-PSL)
Subjects: Physics, [PHYS]Physics [physics], Atmospheric Science, Aerospace Engineering, Astronomy and Astrophysics, Plasma, Electron, Equilibrium equation, 7. Clean energy, Physics - Atomic Physics, Geophysics, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Hfr cell, Electron collision, General Earth and Planetary Sciences, Emission spectrum, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ComputingMilieux_MISCELLANEOUS, Line (formation), Atomic data
Abstract: Line ratio of O IV 1407.3 \AA/1401.1 \AA\- is calculated using mostly our own atomic and collisional data. Energy levels and oscillator strengths needed for this calculation have been calculated using a Hartree-Fock relativistic (HFR) approach. The electron collision strengths introduced in the statistic equilibrium equations are fitted by polynomials for different energies. Comparison has also been made with available theoretical results. The provided line ratio has been obtained for a set of electron densities from $10^{8}$ cm$^{-3}$ to $10^{13}$ cm$^{-3}$ and for a fixed temperature of 50 000 K., Comment: 6 pages, 1 figure, 2 tables. Accepted for publication in Advances in Space Research
Published: 2014
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34. Stark broadening of B IV lines for astrophysical and laboratory plasma research

Author: Sylvie Sahal-Bréchot, Magdalena Christova, Zoran Simić, Andjelka Kovačević, Milan S. Dimitrijević, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Astronomical Observatory Belgrade (AOB), Department of Astronomy, and École normale supérieure - Paris (ENS-PSL)
Subjects: Physics, [PHYS]Physics [physics], Atmospheric Science, Atomic Physics (physics.atom-ph), FOS: Physical sciences, Aerospace Engineering, Perturbation (astronomy), Astronomy and Astrophysics, Plasma, Physics - Atomic Physics, Formalism (philosophy of mathematics), symbols.namesake, Geophysics, Stark effect, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, symbols, General Earth and Planetary Sciences, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Hydrogen spectral series, Solar and Stellar Astrophysics (astro-ph.SR), ComputingMilieux_MISCELLANEOUS, Atomic data
Abstract: Stark broadening parameters for 36 multiplets of B IV have been calculated using the semi-classical perturbation formalism. Obtained results have been used to investigate the regularities within spectral series and temperature dependence., 8 pages, 6 figures, 1 table, in press in Advances in Space Research
Published: 2014
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35. Widths and Shifts of Isolated Lines of Neutral and Ionized Atoms Perturbed by Collisions With Electrons and Ions: An Outline of the Semiclassical Perturbation (SCP) Method and of the Approximations Used for the Calculations

Author: Milan S. Dimitrijević, Nabil Ben Nessib, Sylvie Sahal-Bréchot, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), King Saud University [Riyadh] (KSU), and École normale supérieure - Paris (ENS-PSL)
Subjects: Nuclear and High Energy Physics, isolated lines, Stark broadening, impact approximation, semiclassical perturbation picture, Semiclassical physics, Perturbation (astronomy), Electron, 01 natural sciences, Ion, symbols.namesake, Quantum mechanics, Ionization, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], Plasma, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Computational physics, Stark effect, symbols, lcsh:QC770-798, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Perturbation method
Abstract: “Stark broadening” theory and calculations have been extensively developed for about 50 years. The theory can now be considered as mature for many applications, especially for accurate spectroscopic diagnostics and modeling, in astrophysics, laboratory plasma physics and technological plasmas, as well. This requires the knowledge of numerous collisional line profiles. In order to meet these needs, the “SCP” (semiclassical perturbation) method and numerical code were created and developed. The SCP code is now extensively used for the needs of spectroscopic diagnostics and modeling, and the results of the published calculations are displayed in the STARK-B database. The aim of the present paper is to introduce the main approximations leading to the impact of semiclassical perturbation method and to give formulae entering the numerical SCP code, in order to understand the validity conditions of the method and of the results; and also to understand some regularities and systematic trends. This would also allow one to compare the method and its results to those of other methods and codes. 1
Published: 2014
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36. Stark widths of Ar III spectral lines in the atmospheres of subdwarf B stars

Author: Milan S. Dimitrijević, Sylvie Sahal-Bréchot, Nabil Ben Nessib, Rafik Hamdi, Faculté des Sciences de Bizerte [Université de Carthage], Université de Carthage - University of Carthage, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS-PSL)
Subjects: Atmospheric Science, Atomic Physics (physics.atom-ph), Aerospace Engineering, chemistry.chemical_element, FOS: Physical sciences, Spectral line, Physics - Atomic Physics, symbols.namesake, Ionization, Physics::Atomic and Molecular Clusters, Astrophysics::Solar and Stellar Astrophysics, Physics::Atomic Physics, Electron ionization, Solar and Stellar Astrophysics (astro-ph.SR), ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], Argon, Stellar atmosphere, Astronomy and Astrophysics, Subdwarf, Physics - Plasma Physics, Plasma Physics (physics.plasm-ph), Stars, Geophysics, Stark effect, chemistry, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, symbols, General Earth and Planetary Sciences, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: Using semiclassical perturbation approach in impact approximation, we have calculated Stark widths for 32 spectral lines of doubly charged argon (Ar III). Oscillator strengths are calculated using Hartree-Fock method with relativistic correction (HFR) and an atomic model including 17 configurations. Energy levels are taken from NIST database. For perturbing levels for which the corresponding energy does not exist in NIST database, the calculated energies are used. Our widths are compared with the experimental results. The results presented here are of interest for modelling and investigation of stellar atmospheres since argon in different ionization stages is observed in many astrophysical objects. Finally, the importance of Stark broadening mechanism is studied in the atmospheric conditions of sdB stars. Electron impact Stark widths are compared to thermal Doppler widths as a function of temperature and optical depth of atmospheric layers., 8 pages, 6 figures, 1 table, in press in Advances in Space Research
Published: 2013
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37. Electron impact broadening of Si IV spectral lines: Comparison with recent experiments

Author: Haykel Elabidi, Nébil Ben Nessib, Sylvie Sahal-Bréchot, Umm Al-Qura University, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS Paris)
Subjects: Physics, [PHYS]Physics [physics], Radiation, Perturbation (astronomy), Semiclassical physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Spectral line, symbols.namesake, Stark effect, 0103 physical sciences, symbols, Atomic physics, 010306 general physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Quantum, Spectroscopy, Electron ionization, ComputingMilieux_MISCELLANEOUS, Atomic data
Abstract: Electron impact widths of eight Si IV spectral lines have been calculated using our quantum mechanical method. Semiclassical perturbation calculations using atomic data from the SUPERSTRUCTURE code have been also performed. Comparison with recent measurements shows that they are always lower than our quantum mechanical, semiclassical perturbation and all other theoretical results. A disagreement in the importance of fine structure effects between our results and the measured ones has been reported here.
Published: 2012
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38. Virtual Laboratory Astrophysics: the STARK-B database for spectral line broadening by collisions with charged particles and its link to the European project VAMDC

Author: Nicolas Moreau, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), and Belgrade Astronomical Observatory
Subjects: Physics, History, Database, Context (language use), computer.software_genre, Charged particle, Spectral line, Computer Science Applications, Education, symbols.namesake, Stark effect, Observatory, Ionization, symbols, media_common.cataloged_instance, Physics::Atomic Physics, European union, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], computer, media_common, Line (formation)
Abstract: International audience; Atomic physics in plasmas has been an essential tool for many years. Accurate spectroscopic diagnostics and modeling require the knowledge of numerous collisional line profiles. "Stark broadening" theories and calculations have been extensively developed for about 50 years. Nowadays, the access to such data via an on line database becomes essential. The aim of STARK-B is to reply to this need. It is a collaborative project between the Astronomical Observatory of Belgrade (AOB) and the "Laboratoire d'Étude du Rayonnement et de la matière en Astrophysique" (LERMA) of the Paris Observatory and CNRS. It is a database of widths and shifts of isolated lines of atoms and ions due to electron and ion impacts that we have calculated and published in international refereed journals (more than 150 papers by Dimitrijevic & Sahal-Bréchot, and colleagues). It is devoted to modeling and spectroscopic diagnostics of stellar atmospheres and envelopes, laboratory plasmas, magnetic fusion plasmas, laser equipments and technological plasmas. Hence, the domain of temperatures and densities covered by the tables is wide and depends on the ionization degree of the considered ion. The STARK-B database is in free access and is is a part of VAMDC: the Virtual Atomic and Molecular Data Centre is an European Union funded collaboration between groups involved in the generation and use of atomic and molecular data. VAMDC aims to build a secure, documented, flexible and interoperable e-science environment-based interface to existing atomic and molecular data. STARK-B and its VAMDC context are presented in this paper.
Published: 2012
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39. Electron-Impact Broadening of C II Spectral Lines

Author: N. Larbi-Terzi, Milan S. Dimitrijević, Sylvie Sahal-Bréchot, Nébil Ben Nessib, Groupe de Recherche en Physique Atomique et Astrophysique, Université de Carthage, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), and Belgrade Astronomical Observatory
Subjects: History, Chemistry, Semiclassical physics, Spectral line, Computer Science Applications, Education, symbols.namesake, Wavelength, Stark effect, Ionization, symbols, Atomic physics, Homogeneous broadening, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Electron ionization, Doppler broadening
Abstract: International audience; Using semiclassical perturbation approach in the impact approximation, we have obtained Stark broadening parameters for 149 C II multiplets. Energy levels and oscillator strengths are taken from the TOPbase database. Results are obtained as a function of temperature, for a perturber densities of 1014,1017 and 1018 cm-3. In addition to electron-impact full half widths and shifts, Stark broadening parameters due to singly ionized carbon-impacts have been calculated, in order to provide Stark broadening data for the important charged perturbers in the atmospheres of carbon white dwarfs. The complete results will be published elsewhere, as well as the comparison to the existing experimental and other theoretical data. As an example of obtained results, we present data for a part of multiplets with wavelengths in the visible part of the spectrum.
Published: 2012
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40. Fine structure collision strengths for S VII lines

Author: Sylvie Sahal-Bréchot, Haykel Elabidi, Nabil Ben Nessib, Umm Al-Qura University, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Paris (ENS Paris)
Subjects: Physics, Coupling, [PHYS]Physics [physics], Superstructure, 010504 meteorology & atmospheric sciences, Scattering, Electron, Condensed Matter Physics, Collision, 01 natural sciences, Atomic and Molecular Physics, and Optics, Ionization, Yield (chemistry), Excited state, 0103 physical sciences, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 010303 astronomy & astrophysics, Mathematical Physics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract: Energy levels, oscillator strengths, radiative decay rates and fine structure collision strengths are presented for six times ionized sulfur S VII. The atomic data are calculated with the SUPERSTRUCTURE code, where relativistic corrections are introduced according to the Breit‐Pauli approach. We include in this work the (1s 2 ) 2s 2 2p 6 , 2s 2 2p 5 3l, 2s2p 6 3l, 2s 2 2p 5 4l (l 6 n 1) configurations that yield the lowest 75 levels. The scattering problem is treated in the distorted wave approach by the code DISTORTED WAVE. This produces collision strengths in LS coupling that will be used by the code JAJOM to transform them into fine structure ones. Fine structure collision strengths for transitions from the ground and the first four excited levels are presented at six electron energies from 20 to 120Ryd by a step of 20Ryd. Our atomic structure data are compared with the available experimental and theoretical results.
Published: 2012
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41. Serbian Virtual Observatory

Author: Veljko Vujičić, Katya Tsvetkova, Milan S. Dimitrijević, Zoran Simić, Sylvie Sahal-Bréchot, D. Jevremović, Vojislava Protić Benišek, Vladimir Benišek, Siniša Nešković, Miodrag Malović, Luka Č. Popović, Jovan Aleksić, and Andjelka Kovačević
Subjects: atomic and molecular data, Astroinformatics, business.industry, Computer science, virtual observatories, astroinformatics e-science, Astronomy, Virtual observatory, language.human_language, law.invention, Telescope, Observatory, law, language, Data center, stark broadening, business, Serbian, Simulation
Abstract: The work on SerVO - Serbian virtual observatory (http://servo.aob.rs/~darko) started in 2008, with aims 1) To establish SerVO and join the EuroVO - European Virtual Observatory and IVOA - Inetrnational Virtual Observatory Alliance; 2) To create SerVO data Center for digitalization and archiving in VO format photo-plates from Belgrade Astronomical Observatory and other astronomical results obtained by the staff; 3) To develop the tools for visualization of data; 3) To develop together with Observatoire de Paris, STARK-B - database containing as the first step Stark widths and shifts of spectral lines, determined within the semiclassical perturbation approach by two of us (MSD-SSB) and to create a mirror site in Belgrade; 4) To make a mirror site for DSED (Darthmouth Stellar Evolution Database) in which development took part one of us (DJ). An additional aim is the creation of VAMDC (Virtual Atomic and Molecular Data Center) AOB (Astronomical Observatory of Belgrade) Node, and a recent objective is the collaboration with the Large Synoptic Telescope (LSST) project.In this contribution SerVO project is reviewed within the context of e-science in Astronomy -- Astroinformatics.
Published: 2012

42. Virtual laboratory astrophysics : The STARK-B database

Author: Nicolas Moreau, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), and Belgrade Astronomical Observatory
Subjects: Physics, Database, General Engineering, Stellar atmosphere, Astronomy and Astrophysics, Electron, computer.software_genre, Ion, symbols.namesake, Stark effect, Space and Planetary Science, Observatory, Ionization, symbols, media_common.cataloged_instance, European union, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], computer, Line (formation), media_common
Abstract: International audience; Stark broadening theories and calculations have been extensively developed for about 50 years. The theory can now be considered as mature for many applications, especially for accurate spectroscopic diagnostics and modelling. This requires the knowledge of numerous collisional line profiles, especially for very low abundant atoms and ions which are used as probes for modern spectroscopic diagnostics in astrophysics. Nowadays, the access to such data via an on line database becomes essential. STARK-B (http://stark-b.obspm.fr) is a collaborative project between the Astronomical Observatory of Belgrade and the Laboratoire d'Étude du Rayonnement et de la matière en Astrophysique (LERMA). It is a database of calculated widths and shifts of isolated lines of atoms and ions due to electron and ion collisions (impacts). It is devoted to modelling and spectroscopic diagnostics of stellar atmospheres and envelopes, laboratory plasmas, laser equipments and technological plasmas. Hence, the domain of temperatures and densities covered by the tables is wide and depends on the ionization degree of the considered ion. The STARK-B database is a part of VAMDC (Virtual Atomic and Molecular Data Centre, http://www.vamdc.eu), which is an European Union funded collaboration between groups involved in the generation and use of atomic and molecular data. VAMDC aims to build a secure, documented, flexible and interoperable e-science environment-based interface to existing atomic and molecular data.
Published: 2011
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43. Radiative atomic data and fine-structure collision strengths for neon-like sulfur

Author: Haykel Elabidi, Sylvie Sahal-Bréchot, Nébil Ben Nessib, Groupe de Recherche en Physique Atomique et Astrophysique, Université de Carthage, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)
Subjects: History, Structure (category theory), chemistry.chemical_element, Collision, Sulfur, Computer Science Applications, Education, Neon, chemistry, Physics::Atomic and Molecular Clusters, Radiative transfer, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Physics::Atomic Physics, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Energy (signal processing), Atomic data
Abstract: International audience; We have employed the distorted wave method to calculate radiative and collisional atomic data for the neon-like sulfur S VII. Fine-structure collision strengths have been calculated at many energy values.
Published: 2011
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44. Stark Broadening of Several ne II, ne III and O III Spectral Lines for the Stark-B Database

Author: Zoran Simić, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Andjelka Kovačević, Belgrade Astronomical Observatory, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), and Department of Astronomy, Faculty of Mathematics, University of Belgrade
Subjects: databases, 010504 meteorology & atmospheric sciences, Proton, Astronomy, Doubly ionized oxygen, chemistry.chemical_element, FOS: Physical sciences, QB1-991, Electron, Computer Science::Computational Geometry, computer.software_genre, 01 natural sciences, 7. Clean energy, Research Infrastructures, Spectral line, symbols.namesake, physical data and processes, Ionization, 0103 physical sciences, Physics::Atomic and Molecular Clusters, stark broadening, Physics::Atomic Physics, line profiles, 010303 astronomy & astrophysics, Helium, Solar and Stellar Astrophysics (astro-ph.SR), 0105 earth and related environmental sciences, Physics, Database, Stellar atmosphere, Astronomy and Astrophysics, Stark effect, chemistry, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, symbols, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], computer
Abstract: In order to complete Stark broadening data for Ne II, and O III lines, needed for analysis of stellar atmospheres, we determined, within the semiclassical perturbation method, the missing Stark broadening parameters for the broadening by collisions with protons and ionized helium, for 15 Ne II and 5 O III multiplets. Also, electron, proton and ionized helium impact broadening parameters for an important Ne II multiplet in the visible part of the spectrum and for three Ne III multiplets were calculated. The obtained data will be included in the STARK-B database, which is a part of the Virtual Atomic and Molecular Data Center.
Published: 2011
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45. Cross Sections for Electron Impact Excitation of O VI Lines

Author: Nébil Ben Nessib, Haykel Elabidi, Sylvie Sahal-Bréchot, Henry, Florence, Groupe de Recherche en Physique Atomique et Astrophysique, Université de Carthage, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)
Subjects: distorted wave method, Physics, plasma diagnostics, Atomic Physics (physics.atom-ph), Astronomy, oscillator strengths, FOS: Physical sciences, cross sections, QB1-991, Astronomy and Astrophysics, Collision, Physics - Atomic Physics, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, impact excitation by electrons, Radiative transfer, Plasma diagnostics, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], Solar and Stellar Astrophysics (astro-ph.SR), Excitation, Electron ionization, Atomic data
Abstract: Radiative atomic data and electron impact excitation cross sections for the $2s-2p$ transitions in O VI for transitions among the fine structure levels belonging to the $1s^{2}nl$ ($2\leq n\leq5$) configurations have been calculated. We have extended the calculations of fine structure collision strengths up to 140 Ry and have compared our results at energies below 63 Ry to the R-matrix ones., 4 pages, 4 figures
Published: 2011

46. European Virtual Atomic Data Centre - VAMDC

Author: Luka Č. Popović, Darko Jevremović, Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Andjelka Kovačević, Belgrade Astronomical Observatory, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), and Department of Astronomy, Faculty of Mathematics, University of Belgrade
Subjects: History, Computer science, business.industry, Interface (computing), Interoperability, Computer Science Applications, Education, World Wide Web, media_common.cataloged_instance, Data center, European union, business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Atomic data, media_common
Abstract: International audience; The Virtual Atomic and Molecular Data Centre (http://www.vamdc.eu, VAMDC) is an European Union funded FP7 project aiming to build a secure, documented, flexible and interoperable e-science environment-based interface to existing atomic and molecular data. It will also provide a forum for training potential users and dissemination of expertise worldwide. This review describes the VAMDC project and its objectives.
Published: 2010
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47. VAMDC--The Virtual Atomic and Molecular Data Centre--A New Way to Disseminate Atomic and Molecular Data--VAMDC Level 1 Release

Author: C. Joblin, Bernard Schmitt, M. Doronin, V. Wakelam, K. W. Smith, Guy Rixon, Stephan Schlemmer, L. Nenadovic, P. Le Sidaner, Christian P. Endres, V.I. Perevalov, Sylvie Sahal-Bréchot, Nicholas A. Walton, Marie-Lise Dubernet, Luis A. Núñez, P. A. Loboda, Kevin Benson, Friedrich Kupka, Laurence S. Rothman, Helen E. Mason, J. Bureau, Giacomo Mulas, J. L. Culhane, Yuri Ralchenko, Christian Hill, Vl.G. Tyuterev, T. A. Ryabchikova, Asif Akram, Thomas Marquart, Jonathan Tennyson, Tom J. Millar, Nigel J. Mason, Milan S. Dimitrijević, Nikolai Piskunov, A. Shih, Ulrike Heiter, D. W. Witherick, Giuseppe Leto, E. Roueff, C. J. Zeippen, A N Ryabtsev, Vincent Boudon, Alexander Fazliev, Claudio Mendoza, Institute of Astronomy [Cambridge], University of Cambridge [UK] (CAM), Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Department of Physics and Astronomy [Uppsala], Uppsala University, The Open University [Milton Keynes] (OU), Observatoire de Paris - Site de Meudon (OBSPM), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Physikalisches Institut [Köln], Universität zu Köln, Department of Physics and Astronomy [UCL London], University College of London [London] (UCL), Mullard Space Science Laboratory (MSSL), I. Physikalisches Institut [Köln], Faculty of Mathematics [Vienna], University of Vienna [Vienna], Department of Astronomy and Space Physics [Uppsala], INAF - Osservatorio Astronomico di Cagliari (OAC), Istituto Nazionale di Astrofisica (INAF), National Institute of Standards and Technology [Gaithersburg] (NIST), School of Mathematics and Physics [Belfast], Queen's University [Belfast] (QUB), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG ), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Astronomical Observatory Belgrade (AOB), V.E. Zuev Institute of Atmospheric Optics (IAO), Siberian Branch of the Russian Academy of Sciences (SB RAS), Centre d'étude spatiale des rayonnements (CESR), Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, INAF - Osservatorio Astrofisico di Catania (OACT), All-Russian Scientific Research Institute of Technical Physics RFNTC VNIITF, Department of Applied Mathematics and Theoretical Physics (DAMTP), Instituto Venezolano de Investigaciones Cientificas (IVIC), Universidad de Los Andes [Venezuela] (ULA), Universidad Industrial de Santander [Bucaramanga] (UIS), Laboratory of Theoretical Spectroscopy [Tomsk] (LTS), Siberian Branch of the Russian Academy of Sciences (SB RAS)-Siberian Branch of the Russian Academy of Sciences (SB RAS), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Planétologie de Grenoble (LPG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Technologie de Belfort-Montbeliard (UTBM)-Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Department of Applied Mathematics and Theoretical Physics / Centre for Mathematical Sciences (DAMTP/CMS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Universität zu Köln = University of Cologne, Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and Universidad de Los Andes [Mérida, Venezuela] (ULA)
Subjects: 010304 chemical physics, Computer science, business.industry, Interface (Java), [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Data management, Interoperability, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], 01 natural sciences, Molecular Databases, 0103 physical sciences, Computer software, Data center, business, Software engineering, 010303 astronomy & astrophysics, Dissemination, ComputingMilieux_MISCELLANEOUS
Abstract: The Virtual Atomic and Molecular Data Centre (VAMDC, http://www.vamdc.eu/) is a European‐Union‐funded collaboration between groups involved in the generation, evaluation, and use of atomic and molecular data. VAMDC aims to build a reliable, open, flexible and interoperable e‐science interface to existing atomic and molecular data. The project will cover establishing the core consortium, the development and deployment of the infrastructure and the development of interfaces to the existing atomic and molecular databases. This paper describes the organisation of the project and the achievements during its first year.
Published: 2010
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48. The Project of Serbian Virtual Observatory and Data for Stellar Atmosphere Modeling

Author: Z. Simic, Dragana Ilic, M. Malović, Jelena Kovacevic, A. Kovacevic, V. Protic Benisek, N. Gavrilovic, Vojislava Protić Benišek, Milan S. Dimitrijević, Sylvie Sahal-Bréchot, D. Jevremović, Katya Tsvetkova, Luka Č. Popović, Edi Bon, Miodrag Dačić, Belgrade Astronomical Observatory, Observatoire de Paris, Université Paris sciences et lettres (PSL), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Faculty of Mathematics, University of Belgrade, Institute of Astronomy, Bulgarian Academy of Sciences, and Department for Astrophysics, Astronomical Observatory
Subjects: 010504 meteorology & atmospheric sciences, Stark broadening, Semiclassical physics, Astrophysics, Virtual observatory, 01 natural sciences, symbols.namesake, Databases, Observatory, 0103 physical sciences, Physics::Atomic Physics, 010303 astronomy & astrophysics, Stellar evolution, Atomic data, 0105 earth and related environmental sciences, Physics, business.industry, Stellar atmosphere, Astronomy, Astronomy and Astrophysics, Virtual Observatory, Stark effect, Space and Planetary Science, symbols, Data center, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], business, Stars evolution
Abstract: International audience; We review recent developments in Serbian Virtual Observatory (SerVO) as well as developments surrounding Virtual Atomic and Molecular Data Center. Main components of SerVO are going to be the archive of photographic plates, database of Stark broadening parameters and stellar evolution database. Photographic plates were obtained at Belgrade Observatory from 1936 to 1996. Data for Stark broadening were obtained using semiclassical perturbation and modified semiempirical theories. Stellar evolution database is a mirror of Darthmouth evolution database with improvement and VO compatible outputs.
Published: 2009
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49. Stark broadening parameters of Ne I 837.8 nm spectral line

Author: Sylvie Sahal-Bréchot, Milan S. Dimitrijević, Z. Simic, Magdalena Christova, Department of Applied Physics, Technical University of Sofia, Belgrade Astronomical Observatory, Observatoire de Paris, Université Paris sciences et lettres (PSL), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Dynamique des milieux interstellaires et plasmas stellaires, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)
Subjects: Physics, History, symbols.namesake, Stark effect, symbols, Atomic physics, Homogeneous broadening, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Spectral line, Computer Science Applications, Education, Doppler broadening
Abstract: International audience; The Stark broadening parameters of Ne I 837.8 nm spectral line corresponding to the transition 2p53d 2[7/2]°4 - 2p53p 2[5/2]3 have been calculated using Sahal-Bréchot theory. The temperature dependence of the width and shift has been obtained.
Published: 2008
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50. Electron impact broadening of spectral lines in Be-like ions : quantum calculations

Author: M. Cornille, Sylvie Sahal-Bréchot, J Dubau, Nébil Ben Nessib, Haykel Elabidi, Laboratoire d'interaction du rayonnement X avec la matière (LIXAM), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Groupe de Recherche en Physique Atomique et Astrophysique, Université de Carthage, Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), and Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Coupling, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], Plasma, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Spectral line, Ion, symbols.namesake, Stark effect, symbols, Physics::Atomic Physics, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Quantum, Electron ionization, ComputingMilieux_MISCELLANEOUS
Abstract: International audience; We present in this paper quantum mechanical calculations for the electron impact Stark linewidths of the 2s3s-2s3p transitions for the four beryllium-like ions from N IV to Ne VII. Calculations are made in the frame of the impact approximation and intermediate coupling, taking into account fine-structure effects. A comparison between our calculations, experimental and other theoretical results, shows a good agreement. This is the first time that such a good agreement is found between quantum and experimental linewidths of highly charged ions.
Published: 2008
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