Interaction of D2 with H2O amorphous ice studied by temperature-programmed desorption experiments

The Journal of Chemical Physics
L AmiaudJ L Lemaire

Abstract

The gas-surface interaction of molecular hydrogen D2 with a thin film of porous amorphous solid water (ASW) grown at 10 K by slow vapor deposition has been studied by temperature-programmed-desorption (TPD) experiments. Molecular hydrogen diffuses rapidly into the porous network of the ice. The D2 desorption occurring between 10 and 30 K is considered here as a good probe of the effective surface of ASW interacting with the gas. The desorption kinetics have been systematically measured at various coverages. A careful analysis based on the Arrhenius plot method has provided the D2 binding energies as a function of the coverage. Asymmetric and broad distributions of binding energies were found, with a maximum population peaking at low energy. We propose a model for the desorption kinetics that assumes a complete thermal equilibrium of the molecules with the ice film. The sample is characterized by a distribution of adsorption sites that are filled according to a Fermi-Dirac statistic law. The TPD curves can be simulated and fitted to provide the parameters describing the distribution of the molecules as a function of their binding energy. This approach contributes to a correct description of the interaction of molecular hydrogen ...Continue Reading

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Citations

Mar 29, 2014·Physical Chemistry Chemical Physics : PCCP·S IoppoloH Linnartz
Mar 29, 2014·Physical Chemistry Chemical Physics : PCCP·M MinissaleH Linnartz
Aug 21, 2007·The Journal of Chemical Physics·Farahjabeen IslamStephen D Price
Oct 16, 2007·The Journal of Chemical Physics·Baruch Barzel, Ofer Biham
Oct 5, 2013·The Journal of Chemical Physics·Massimo Mella, E Curotto
Feb 25, 2014·The Journal of Chemical Physics·M MinissaleF Dulieu
Oct 29, 2013·Chemical Reviews·Gianfranco Vidali
Jul 8, 2015·Physical Chemistry Chemical Physics : PCCP·Y Kunisada, H Kasai
May 22, 2009·Physical Chemistry Chemical Physics : PCCP·Jean-Hugues FillionJean-Louis Lemaire
Mar 15, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·G Vidali, L Li
Mar 30, 2011·Physical Chemistry Chemical Physics : PCCP·Mario AccollaValerio Pirronello
Jan 18, 2014·Physical Chemistry Chemical Physics : PCCP·Jiao HeGianfranco Vidali
Nov 30, 2010·Physical Chemistry Chemical Physics : PCCP·M ChehrouriJ L Lemaire
Aug 23, 2011·Physical Chemistry Chemical Physics : PCCP·Micha Polak, Leonid Rubinovich
Sep 11, 2013·Physical Chemistry Chemical Physics : PCCP·Anna ClemensDinko Chakarov
Oct 11, 2014·Faraday Discussions·Jiao He, Gianfranco Vidali
Jun 26, 2014·Physical Chemistry Chemical Physics : PCCP·Christian MitterdorferThomas Loerting
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Aug 3, 2011·Physical Chemistry Chemical Physics : PCCP·Jiao HeGianfranco Vidali
Sep 14, 2010·The Journal of Physical Chemistry. a·Ling LiOfer Biham

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