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1. The composition of the protosolar disk and the formation conditions for comets

Author

Willacy, K., Alexander, C., Ali-Dib, M., Ceccarelli, C., Charnley, S. B., Doronin, M., Ellinger, Y., Gast, P., Gibb, E., Milam, S. N., Mousis, O., Pauzat, E., Tornow, C., Wirstrom, E. S., and Zicler, E

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Conditions in the protosolar nebula have left their mark in the composition of cometary volatiles, thought to be some of the most pristine material in the solar system. Cometary compositions represent the end point of processing that began in the parent molecular cloud core and continued through the collapse of that core to form the protosun and the solar nebula, and finally during the evolution of the solar nebula itself as the cometary bodies were accreting. Disentangling the effects of the various epochs on the final composition of a comet is complicated. But comets are not the only source of information about the solar nebula. Protostellar disks around young stars similar to the protosun provide a way of investigating the evolution of disks similar to the solar nebula while they are in the process of evolving to form their own solar systems. In this way we can learn about the physical and chemical conditions under which comets formed, and about the types of dynamical processing that shaped the solar system we see today. This paper summarizes some recent contributions to our understanding of both cometary volatiles and the composition, structure and evolution of protostellar disks., Comment: To appear in Space Science Reviews. The final publication is available at Springer via http://dx.doi.org/10.1007/s11214-015-0167-6

Published
2015
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8. The Composition of the Protosolar Disk and the Formation Conditions for Comets

Author

Willacy, K., primary, Alexander, C., additional, Ali-Dib, M., additional, Ceccarelli, C., additional, Charnley, S. B., additional, Doronin, M., additional, Ellinger, Y., additional, Gast, P., additional, Gibb, E., additional, Milam, S. N., additional, Mousis, O., additional, Pauzat, F., additional, Tornow, C., additional, Wirström, E. S., additional, and Zicler, E., additional

Published
2017
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21. Adsorption energies and prefactor determination for CH3OH adsorption on graphite.

Author

Doronin, M., Bertin, M., Michaut, X., Philippe, L., and Fillion, J.-H.

Subjects
*THERMAL desorption, *ADSORPTION (Chemistry), *GRAPHITE, *METHANOL, *HEATING, *FORCE & energy
Abstract

In this paper, we have studied adsorption and thermal desorption of methanol CH3OH on graphite surface, with the specific aim to derive from experimental data quantitative parameters that govern the desorption, namely, adsorption energy Eads and prefactor of the Polanyi-Wigner law. In low coverage regime, these two values are interconnected and usually the experiments can be reproduced with any couple (Eads), which makes intercomparison between studies difficult since the results depend on the extraction method. Here, we use a method for determining independently the average adsorption energy and a prefactor value that works over a large range of incident methanol coverage, from a limited set of desorption curves performed at different heating rates. In the low coverage regime the procedure is based on a first order kinetic law, and considers an adsorption energy distribution which is not expected to vary with the applied heating rate. In the case of CH3OH multilayers, Eads is determined as 430 meV with a prefactor of 5 × 1014 s-1. For CH3OH submonolayers on graphite, adsorption energy of 470 ± 30 meV and a prefactor of (8 ± 3) × 1016 s-1 have been found. These last values, which do not change between 0.09 ML and 1 ML initial coverage, suggest that the methanol molecules form island-like structure on the graphite even at low coverage. [ABSTRACT FROM AUTHOR]

Published
2015
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26. Nitrile versus isonitrile adsorption at interstellar grain surfaces: II. Carbonaceous aromatic surfaces

Author

Bertin, M., Doronin, M., Michaut, X., Philippe, L., Markovits, A., Fillion, J.-H., Pauzat, F., Ellinger, Y., Guillemin, J.-C., 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 de chimie théorique (LCT), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), PCMI, ANR-11-10EX-0004-02, Labex MiChem, École normale supérieure - Paris (ENS-PSL), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
astrochemistry, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], ISM: abundances, ISM: molecules
Abstract

International audience; Context. Almost 20% of the ~200 different species detected in the interstellar and circumstellar media present a carbon atom linked to nitrogen by a triple bond. Of these 37 molecules, 30 are nitrile R-CN compounds, the remaining 7 belonging to the isonitrile R-NC family. How these species behave in their interactions with the grain surfaces is still an open question. Aims. In a previous work, we have investigated whether the difference between nitrile and isonitrile functional groups may induce differences in the adsorption energies of the related isomers at the surfaces of interstellar grains of various nature and morphologies. This study is a follow up of this work, where we focus on the adsorption on carbonaceous aromatic surfaces. Methods. The question is addressed by means of a concerted experimental and theoretical approach of the adsorption energies of CH3CN and CH3NC on the surface of graphite (with and without surface defects). The experimental determination of the molecule and surface interaction energies is carried out using temperature-programmed desorption in an ultra-high vacuum between 70 and 160 K. Theoretically, the question is addressed using first-principle periodic density functional theory to represent the organised solid support.Results. The adsorption energy of each compound is found to be very sensitive to the structural defects of the aromatic carbonaceous surface: these defects, expected to be present in a large numbers and great diversity on a realistic surface, significantly increase the average adsorption energies to more than 50% as compared to adsorption on perfect graphene planes. The most stable isomer (CH3CN) interacts more efficiently with the carbonaceous solid support than the higher energy isomer (CH3NC), however.

Published
2017
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32. Neutral Na in comet tails: a chemical story

Author

Ellinger, Y., Pauzat, F., Mousis, O., Guilbert-Lepoutre, A., Leblanc, François, Ali-Dib, M., Doronin, M., Zicler, E., Doressoundiram, A., Laboratoire de chimie théorique (LCT), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Besançon, Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), HELIOS - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-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)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Sorbonne Université (SU)-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), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), 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), and Cardon, Catherine

Subjects
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [SDU.ASTR.SR] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Astrophysics::Earth and Planetary Astrophysics
Abstract

International audience; The origin of the neutral sodium comet tail discovered in comet Hale-Bopp in 1997 is still a matter of discussion. Here we propose a scenario which is based on chemical grounds. The starting point is the chemical trapping of the Na+ ion in the refractory material during the condensation phase of the protosolar nebula, followed by its incorporation in the building blocks of the comets parent bodies. In the next step, the Na+ ions are washed out of the refractory material by the water formed by the melting of the ice due to the heat released in the radioactive decay of short period elements. When the water freezes again, the Na+ ion looses its positive charge to evolve progressively toward a neutral atom when approaching the surface of the ice. As shown by high-level numerical simulations based on first principle periodic density functional theory (DFT) to describe the solid structure of the ice, it is a neutral Na that is ejected with the sublimation of the ice top layer

Published
2015

34. The virtual atomic and molecular data centre (VAMDC) consortium

Author

Dubernet, M. L., Antony, B. K., Ba, Y. A., Babikov, Yu L., Bartschat, K., Boudon, V., Braams, B. J., Chung, H-K, Daniel, F., Delahaye, F., Del Zanna, G., de Urquijo, J., Dimitrijevic, M. S., Domaracka, A., Doronin, M., Drouin, B. J., Endres, C. P., Fazliev, A. Z., Gagarin, S. V., Gordon, I. E., Gratier, P., Heiter, Ulrike, Hill, C., Jevremovic, D., Joblin, C., Kasprzak, A., Krishnakumar, E., Leto, G., Loboda, P. A., Louge, T., Maclot, S., Marinkovic, B. P., Markwick, A., Marquart, Thomas, Mason, H. E., Mason, N. J., Mendoza, C., Mihajlov, A. A., Millar, T. J., Moreau, N., Mulas, G., Pakhomov, Yu, Palmeri, P., Pancheshnyi, S., Perevalov, V. I., Piskunov, Nikolai, Postler, J., Quinet, P., Quintas-Sanchez, E., Ralchenko, Yu, Rhee, Y-J, Rixon, G., Rothman, L. S., Roueff, E., Ryabchikova, T., Sahal-Brechot, S., Scheier, P., Schlemmer, S., Schmitt, B., Stempels, Eric H. C., Tashkun, S., Tennyson, J., Tyuterev, Vl G., Vujcic, V., Wakelam, V., Walton, N. A., Zatsarinny, O., Zeippen, C. J., Zwoelf, C. M., Dubernet, M. L., Antony, B. K., Ba, Y. A., Babikov, Yu L., Bartschat, K., Boudon, V., Braams, B. J., Chung, H-K, Daniel, F., Delahaye, F., Del Zanna, G., de Urquijo, J., Dimitrijevic, M. S., Domaracka, A., Doronin, M., Drouin, B. J., Endres, C. P., Fazliev, A. Z., Gagarin, S. V., Gordon, I. E., Gratier, P., Heiter, Ulrike, Hill, C., Jevremovic, D., Joblin, C., Kasprzak, A., Krishnakumar, E., Leto, G., Loboda, P. A., Louge, T., Maclot, S., Marinkovic, B. P., Markwick, A., Marquart, Thomas, Mason, H. E., Mason, N. J., Mendoza, C., Mihajlov, A. A., Millar, T. J., Moreau, N., Mulas, G., Pakhomov, Yu, Palmeri, P., Pancheshnyi, S., Perevalov, V. I., Piskunov, Nikolai, Postler, J., Quinet, P., Quintas-Sanchez, E., Ralchenko, Yu, Rhee, Y-J, Rixon, G., Rothman, L. S., Roueff, E., Ryabchikova, T., Sahal-Brechot, S., Scheier, P., Schlemmer, S., Schmitt, B., Stempels, Eric H. C., Tashkun, S., Tennyson, J., Tyuterev, Vl G., Vujcic, V., Wakelam, V., Walton, N. A., Zatsarinny, O., Zeippen, C. J., and Zwoelf, C. M.

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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36. The virtual atomic and molecular data centre (VAMDC) consortium

Author

Dubernet, M L, primary, Antony, B K, additional, Ba, Y A, additional, Babikov, Yu L, additional, Bartschat, K, additional, Boudon, V, additional, Braams, B J, additional, Chung, H-K, additional, Daniel, F, additional, Delahaye, F, additional, Zanna, G Del, additional, Urquijo, J de, additional, Dimitrijević, M S, additional, Domaracka, A, additional, Doronin, M, additional, Drouin, B J, additional, Endres, C P, additional, Fazliev, A Z, additional, Gagarin, S V, additional, Gordon, I E, additional, Gratier, P, additional, Heiter, U, additional, Hill, C, additional, Jevremović, D, additional, Joblin, C, additional, Kasprzak, A, additional, Krishnakumar, E, additional, Leto, G, additional, Loboda, P A, additional, Louge, T, additional, Maclot, S, additional, Marinković, B P, additional, Markwick, A, additional, Marquart, T, additional, Mason, H E, additional, Mason, N J, additional, Mendoza, C, additional, Mihajlov, A A, additional, Millar, T J, additional, Moreau, N, additional, Mulas, G, additional, Pakhomov, Yu, additional, Palmeri, P, additional, Pancheshnyi, S, additional, Perevalov, V I, additional, Piskunov, N, additional, Postler, J, additional, Quinet, P, additional, Quintas-Sánchez, E, additional, Ralchenko, Yu, additional, Rhee, Y-J, additional, Rixon, G, additional, Rothman, L S, additional, Roueff, E, additional, Ryabchikova, T, additional, Sahal-Bréchot, S, additional, Scheier, P, additional, Schlemmer, S, additional, Schmitt, B, additional, Stempels, E, additional, Tashkun, S, additional, Tennyson, J, additional, Tyuterev, Vl G, additional, Vujčić, V, additional, Wakelam, V, additional, Walton, N A, additional, Zatsarinny, O, additional, Zeippen, C J, additional, and Zwölf, C M, additional

Published
2016
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37. BASECOL and VAMDC: A new way to access and manipulate molecular collisional data for interstellar applications

Author

Daniel, F., Dubernet, M.L., Doronin, M., Nenadovic, L., Bureau, Jérôme, Centro de Astrobiologia [Madrid] (CAB), Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), 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), Université Paris sciences et lettres (PSL), 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), École normale supérieure - Paris (ENS-PSL), 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), Ctr Astrobiol CSIC INTA, Lab Astrofis Mol, Madrid 28850, Spain, Ctr Astrobiol CSIC INTA, Lab Astrofis Mol, Madrid, 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), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Francois, Françoise

Subjects
[PHYS.ASTR.EP] Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], [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], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2011

38. VAMDC Virtual Atomic and Molecular Centre and Astrophysics: Level 2 release - Poster

Author

Doronin, M., Dubernet, M.L., Consortium, And Vamdc, Francois, Françoise, 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), 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), and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.ASTR.EP] Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2011

42. The Composition of the Protosolar Disk and the Formation Conditions for Comets

Author

Willacy, K., primary, Alexander, C., additional, Ali-Dib, M., additional, Ceccarelli, C., additional, Charnley, S. B., additional, Doronin, M., additional, Ellinger, Y., additional, Gast, P., additional, Gibb, E., additional, Milam, S. N., additional, Mousis, O., additional, Pauzat, F., additional, Tornow, C., additional, Wirström, E. S., additional, and Zicler, E., additional

Published
2015
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44. BASECOL and VAMDC: A new way to access and manipulate molecular collisional data for interstellar applications - POSTER

Author

Doronin, M., Nenadovic, L., Bureau, Jérôme, Dubernet, M.L., Francois, Francoise, Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.ASTR.EP] Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Published
2010

45. Spectrally-resolved UV photodesorption of CH4 in pure and layered ices.

Author

Dupuy, R., Bertin, M., Féraud, G., Michaut, X., Jeseck, P., Doronin, M., Philippe, L., Romanzin, C., and Fillion, J.-H.

Abstract

Context. Methane is among the main components of the ice mantles of interstellar dust grains, where it is at the start of a rich solid-phase chemical network. Quantification of the photon-induced desorption yield of these frozen molecules and understanding of the underlying processes is necessary to accurately model the observations and the chemical evolution of various regions of the interstellar medium. Aims. This study aims at experimentally determining absolute photodesorption yields for the CH4 molecule as a function of photon energy. The influence of the ice composition is also investigated. By studying the methane desorption from layered CH4:CO ice, indirect desorption processes triggered by the excitation of the CO molecules are monitored and quantified. Methods. Tunable monochromatic vacuum ultraviolet light (VUV) light from the DESIRS beamline of the SOLEIL synchrotron is used in the 7-13.6 eV (177-91 nm) range to irradiate pure CH4 or layers of CH4 deposited on top of CO ice samples. The release of species in the gas phase is monitored by quadrupole mass spectrometry, and absolute photodesorption yields of intact CH4 are deduced. Results. CH4 photodesorbs for photon energies higher than ~9.1 eV (~136 nm). The photodesorption spectrum follows the absorption spectrum of CH4, which confirms a desorption mechanism mediated by electronic transitions in the ice. When it is deposited on top of CO, CH4 desorbs between 8 and 9 eV with a pattern characteristic of CO absorption, indicating desorption induced by energy transfer from CO molecules. Conclusions. The photodesorption of CH4 from pure ice in various interstellar environments is around 2.0 ± 1.0 × 10-3 molecules per incident photon. Results on CO-induced indirect desorption of CH4 provide useful insights for the generalization of this process to other molecules co-existing with CO in ice mantles. [ABSTRACT FROM AUTHOR]

Published
2017
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47. “Virtual Atomic and Molecular Data Centre” and Astrophysics : Level 2 Release

Author

Doronin, M., Dubernet, M. L., Walton, N., Mason, N., Rixon, G., Sidaner, P. L., Schlemmer, S., Piskunov, N., Tennyson, J., Akram, A., Endres, C., Hill, C., Marquart, T., Nenadovic, L., Smith, K., Consortium, Vamdc, Doronin, M., Dubernet, M. L., Walton, N., Mason, N., Rixon, G., Sidaner, P. L., Schlemmer, S., Piskunov, N., Tennyson, J., Akram, A., Endres, C., Hill, C., Marquart, T., Nenadovic, L., Smith, K., and Consortium, Vamdc

Abstract

The Virtual Atomic and Molecular Data Centre (VAMDC, \lta href=’http://www.vamdc.eu/’\gthttp://www.vamdc.eu/\lt/a\gt) is a consortium between groups involved in the generation, evaluation, and use of atomic and molecular data, funded by the European Union. 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 at the end of its second year.

Published
2012

49. BASECOL2012: A collisional database repository and web service within the Virtual Atomic and Molecular Data Centre (VAMDC)

Author

Dubernet, M.-L., primary, Alexander, M. H., additional, Ba, Y. A., additional, Balakrishnan, N., additional, Balança, C., additional, Ceccarelli, C., additional, Cernicharo, J., additional, Daniel, F., additional, Dayou, F., additional, Doronin, M., additional, Dumouchel, F., additional, Faure, A., additional, Feautrier, N., additional, Flower, D. R., additional, Grosjean, A., additional, Halvick, P., additional, Kłos, J., additional, Lique, F., additional, McBane, G. C., additional, Marinakis, S., additional, Moreau, N., additional, Moszynski, R., additional, Neufeld, D. A., additional, Roueff, E., additional, Schilke, P., additional, Spielfiedel, A., additional, Stancil, P. C., additional, Stoecklin, T., additional, Tennyson, J., additional, Yang, B., additional, Vasserot, A.-M., additional, and Wiesenfeld, L., additional

Published
2013
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