Physisorption and desorption of H2, HD and D2 on amorphous solid water ice. Effect on mixing isotopologue on statistical population of adsorption sites

Lionel Amiaud; Jean-Hugues Fillion; François Dulieu; Anouchah Momeni; Jean-Louis Lemaire

doi:10.1039/C5CP03985A

Physisorption and desorption of H₂, HD and D₂ on amorphous solid water ice. Effect on mixing isotopologue on statistical population of adsorption sites†

Lionel Amiaud,‡*^a Jean-Hugues Fillion,‡^b François Dulieu,‡^c Anouchah Momeni ‡^a and Jean-Louis Lemaire ‡^ad

* Corresponding authors

^a Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, University Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
E-mail: lionel.amiaud@u-psud.fr
Fax: +33 (0)1 69157671
Tel: +33 (0)1 69157684

^b LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC, University Paris 06, Paris, France

^c LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonnes Universités, UPMC University Paris 06, Université de Cergy-Pontoise, Cergy-Pontoise, France

^d LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonnes Universités, UPMC Univ. Paris 06, France

Abstract

We study the adsorption and desorption of three isotopologues of molecular hydrogen mixed on 10 ML of porous amorphous water ice (ASW) deposited at 10 K. Thermally programmed desorption (TPD) of H₂, D₂ and HD adsorbed at 10 K have been performed with different mixings. Various coverages of H₂, HD and D₂ have been explored and a model taking into account all species adsorbed on the surface is presented in detail. The model we propose allows to extract the parameters required to fully reproduce the desorption of H₂, HD and D₂ for various coverages and mixtures in the sub-monolayer regime. The model is based on a statistical description of the process in a grand-canonical ensemble where adsorbed molecules are described following a Fermi–Dirac distribution.

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Article information

DOI: https://doi.org/10.1039/C5CP03985A
Article type: Paper
Submitted: 09 Jul 2015
Accepted: 08 Oct 2015
First published: 13 Oct 2015

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Phys. Chem. Chem. Phys., 2015,17, 30148-30157

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Physisorption and desorption of H₂, HD and D₂ on amorphous solid water ice. Effect on mixing isotopologue on statistical population of adsorption sites

L. Amiaud, J. Fillion, F. Dulieu, A. Momeni and J. Lemaire, Phys. Chem. Chem. Phys., 2015, 17, 30148 DOI: 10.1039/C5CP03985A

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