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Differential adsorption of complex organic molecule isomers on interstellar ice surfaces

Published online by Cambridge University Press:  13 February 2013

M. Bertin ,
X. Michaut ,
M. Lattelais ,
H. Mokrane ,
F. Pauzat ,
J. Pilmé ,
C. Minot ,
Y. Ellinger ,
C. Romanzin  and
P. Jeseck
...Show all authors
M. Bertin
Affiliation:
UPMC, Université Paris 6, Laboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique (LPMAA) – CNRS UMR 7092, 75252 Paris, France
X. Michaut
Affiliation:
UPMC, Université Paris 6, Laboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique (LPMAA) – CNRS UMR 7092, 75252 Paris, France
M. Lattelais
Affiliation:
UPMC Université Paris 6, Laboratoire de Chimie Théorique (LCT) – CNRS UMR 7616, 75252 Paris, France
H. Mokrane
Affiliation:
Observatoire de Paris et Université de Cergy Pontoise, LAMAp/LERMA – CNRS UMR 8112, 95000 Cergy Pontoise Cedex, France
F. Pauzat
Affiliation:
UPMC Université Paris 6, Laboratoire de Chimie Théorique (LCT) – CNRS UMR 7616, 75252 Paris, France
J. Pilmé
Affiliation:
UPMC Université Paris 6, Laboratoire de Chimie Théorique (LCT) – CNRS UMR 7616, 75252 Paris, France
C. Minot
Affiliation:
UPMC Université Paris 6, Laboratoire de Chimie Théorique (LCT) – CNRS UMR 7616, 75252 Paris, France
Y. Ellinger
Affiliation:
UPMC Université Paris 6, Laboratoire de Chimie Théorique (LCT) – CNRS UMR 7616, 75252 Paris, France
C. Romanzin
Affiliation:
UPMC, Université Paris 6, Laboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique (LPMAA) – CNRS UMR 7092, 75252 Paris, France
P. Jeseck
Affiliation:
UPMC, Université Paris 6, Laboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique (LPMAA) – CNRS UMR 7092, 75252 Paris, France
J.-H. Fillion
Affiliation:
UPMC, Université Paris 6, Laboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique (LPMAA) – CNRS UMR 7092, 75252 Paris, France
H. Chaabouni
Affiliation:
Observatoire de Paris et Université de Cergy Pontoise, LAMAp/LERMA – CNRS UMR 8112, 95000 Cergy Pontoise Cedex, France
E. Congiu
Affiliation:
Observatoire de Paris et Université de Cergy Pontoise, LAMAp/LERMA – CNRS UMR 8112, 95000 Cergy Pontoise Cedex, France
F. Dulieu
Affiliation:
Observatoire de Paris et Université de Cergy Pontoise, LAMAp/LERMA – CNRS UMR 8112, 95000 Cergy Pontoise Cedex, France
S. Baouche
Affiliation:
Observatoire de Paris et Université de Cergy Pontoise, LAMAp/LERMA – CNRS UMR 8112, 95000 Cergy Pontoise Cedex, France
J.-L. Lemaire
Affiliation:
Observatoire de Paris et Université de Cergy Pontoise, LAMAp/LERMA – CNRS UMR 8112, 95000 Cergy Pontoise Cedex, France

Abstract

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We present a combined theoretical and experimental study of the adsorption of two pairs of organic isomers, (i) acetic acid AA (CH3COOH) and methyl formate MF (HCOOCH3), and (ii) ethanol EtOH (CH3CH2OH) and dimethyl ether DME (CH3OCH3), onto crystalline water ice surfaces at low temperatures. Both approaches show that, for each pair, the most stable isomer from a thermodynamical point of view, i.e. AA and EtOH, is also the one which is the more tightly bound to the water ice surface compared to the less stable isomers (MF and DME). This finding, which can be explained by the ability of AA or EtOH to efficiently interact with the ice surface via hydrogen bondings, may have important consequences in an astrophysical context, since it could explain why the most stable isomer is not the most abundant observed in the interstellar gas phase.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 58: ECLA - European Conference on Laboratory Astrophysics , 2012 , pp. 349 - 352
Copyright
© The Author(s) 2013

References

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