Issue 6, 2011
From the journal:

Physical Chemistry Chemical Physics

Nuclear spin conversion of molecular hydrogen on amorphous solid water in the presence of O2 traces

M. Chehrouri,ab   J.-H. Fillion,*cd   H. Chaabouni,a   H. Mokrane,a   E. Congiu,a   F. Dulieu,a   E. Matar,a   X. Michautcd  and  J. L. Lemairea  

* Corresponding authors

a LAMAp/LERMA, UMR8112 du CNRS, de l'Observatoire de Paris et de l'Université de Cergy Pontoise, 5 mail Gay-Lussac, 95000 Cergy Pontoise Cedex, France

b LEPC Université de Saida, BP138, E-NSAR, 20002 Saida, Algérie

c UPMC Univ Paris 06, UMR 7092, LPMAA, Paris, France
E-mail: jean-hugues.fillion@upmc.fr
Tel: +33(0)144279605

d CNRS, UMR 7092, LPMAA, Paris, France

Abstract

Nuclear spin conversion (NSC) of ortho- to para-H2 and para- to ortho-D2 has been investigated on an amorphous solid water (ASW) surface at 10 K, in the presence of co-adsorbed O2. The dynamics of the nuclear spin conversion could be revealed by combination of resonance enhanced multiphoton ionization spectroscopy (REMPI) with temperature programmed desorption (TPD) experiments. The conversion rates are consistent with a diffusion of molecular hydrogen inducing a nuclear spin conversion enhanced in the vicinity of molecular oxygen. The conversion times were found to increase with decreasing O2 and H2 coverage. Finally, on oxygen free ASW surface, the extremely long conversion characteristic times measured showed that such surface is not an efficient catalyst for NSC, in contradiction with hypothesis commonly made for interstellar medium.

Graphical abstract: Nuclear spin conversion of molecular hydrogen on amorphous solid water in the presence of O2 traces

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Article information

DOI
https://doi.org/10.1039/C0CP01322F
Article type
Paper
Submitted
26 Jul 2010
Accepted
11 Oct 2010
First published
26 Nov 2010

Phys. Chem. Chem. Phys., 2011,13, 2172-2178

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Nuclear spin conversion of molecular hydrogen on amorphous solid water in the presence of O2 traces

M. Chehrouri, J.-H. Fillion, H. Chaabouni, H. Mokrane, E. Congiu, F. Dulieu, E. Matar, X. Michaut and J. L. Lemaire, Phys. Chem. Chem. Phys., 2011, 13, 2172 DOI: 10.1039/C0CP01322F

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