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VUV spectroscopy and photochemistry of five interstellar andputative prebiotic molecules

Published online by Cambridge University Press:  13 February 2013

M. Schwell ,
F. Gaie-Levrel ,
Y. Bénilan ,
M.-C. Gazeau ,
N. Fray ,
G. Saul ,
N. Champion ,
S. Leach  and
J.-C. Guillemin
M. Schwell
Affiliation:
Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, Universités Paris Est Créteil and Paris Diderot, Institut Pierre Simon Laplace, 61 avenue du Général de Gaulle, 94010 Créteil, France
F. Gaie-Levrel
Affiliation:
Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin, BP. 48, 91192 Gif-sur-Yvette Cedex, France
Y. Bénilan
Affiliation:
Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, Universités Paris Est Créteil and Paris Diderot, Institut Pierre Simon Laplace, 61 avenue du Général de Gaulle, 94010 Créteil, France
M.-C. Gazeau
Affiliation:
Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, Universités Paris Est Créteil and Paris Diderot, Institut Pierre Simon Laplace, 61 avenue du Général de Gaulle, 94010 Créteil, France
N. Fray
Affiliation:
Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, Universités Paris Est Créteil and Paris Diderot, Institut Pierre Simon Laplace, 61 avenue du Général de Gaulle, 94010 Créteil, France
G. Saul
Affiliation:
Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, Universités Paris Est Créteil and Paris Diderot, Institut Pierre Simon Laplace, 61 avenue du Général de Gaulle, 94010 Créteil, France
N. Champion
Affiliation:
Laboratoire d’Étude du Rayonnement et de la Matière en Astrophysique (LERMA), UMR CNRS 8112, Observatoire de Paris-Meudon, 5 place Jules-Jansen, 92195 Meudon, France
S. Leach
Affiliation:
Laboratoire d’Étude du Rayonnement et de la Matière en Astrophysique (LERMA), UMR CNRS 8112, Observatoire de Paris-Meudon, 5 place Jules-Jansen, 92195 Meudon, France
J.-C. Guillemin
Affiliation:
Sciences Chimiques de Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7, France

Abstract

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For many years, our group has been investigating the VUV spectroscopy and photochemistryof molecules of astrophysical (Jochims et al. 2006a,b; Leach et al. 2008; Schwell et al. 2012) and prebiotic interest (Schwell et al. 2006). Polyynes and cyano-polyynes that are abundant inthe interstellar medium (ISM) and in planetary atmospheres, have been investigated too(e.g. Fray et al. 2010). An aerosol source for reactive and thermo-labile compounds has beendeveloped (Gaie-Levrel et al. 2011)to perform gas-phase measurements. These are necessary to measure intrinsic molecularproperties and to compare to quantum chemical calculations. Besides measuring absoluteabsorption and photoionization cross sections, dissociative channels and their involvedexcited states are identified for a number of molecules of interstellar interest.Branching ratios of the respective elementary photoreactions are determined in order tounderstand and model the photochemistry occurring in the ISM. Some very recent results onthe dissociative photoionization of methylformate (MF), glycolaldehyde (GA), dimethylether(DIM), aminoacetonitrile (AAC) and cyanoacetylene (CA), are presented here.

References

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