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Differential adsorption of complex organic molecule isomers oninterstellar 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 pairsof organic isomers, (i) acetic acid AA (CH3COOH) and methylformate MF (HCOOCH3), and (ii) ethanol EtOH(CH3CH2OH) and dimethyl ether DME (CH3OCH3),onto crystalline water ice surfaces at low temperatures. Both approaches show that, foreach pair, the most stable isomer from a thermodynamical point of view,i.e. AA and EtOH, isalso the one which is the more tightly bound to the water ice surface compared to the lessstable isomers (MF and DME). This finding, which can be explained by the ability of AA orEtOH to efficiently interact with the ice surface via hydrogen bondings, may haveimportant consequences in an astrophysical context, since it could explain why the moststable isomer is not the most abundant observed in the interstellar gas phase.

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