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Experiments on molecular hydrogen formation on cold ISM dust

Published online by Cambridge University Press:  21 March 2013

Lisseth Gavilan ,
Jean Louis Lemaire  and
Gianfranco Vidali
Lisseth Gavilan
Affiliation:
LERMA/LAMAp, UMR 8112 du CNRS, de l'Observatoire de Paris et de l'Université de Cergy Pontoise, 5 mail Gay Lussac, 95000 Cergy Pontoise, France email: lisseth.gavilan@obspm.fr
Jean Louis Lemaire
Affiliation:
LERMA/LAMAp, UMR 8112 du CNRS, de l'Observatoire de Paris et de l'Université de Cergy Pontoise, 5 mail Gay Lussac, 95000 Cergy Pontoise, France email: lisseth.gavilan@obspm.fr
Gianfranco Vidali
Affiliation:
LERMA/LAMAp, UMR 8112 du CNRS, de l'Observatoire de Paris et de l'Université de Cergy Pontoise, 5 mail Gay Lussac, 95000 Cergy Pontoise, France email: lisseth.gavilan@obspm.fr
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Abstract

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We investigate the formation of molecular hydrogen on ISM dust grains at T < 10 K. We use laboratory methods to detect newly formed D2 that is rovibrationally excited at v” = 4, J” = 2. We discover that recombination is catalyzed by pre-existing molecules on the dust surface and present this an important process in the coldest regions of the ISM.

Keywords

astrochemistry — ISM: atoms — ISM: molecules — dustextinction
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S292: Molecular Gas, Dust, and Star Formation in Galaxies , August 2012 , pp. 246
Copyright
Copyright © International Astronomical Union 2013