Issue 15, 2011
From the journal:

Physical Chemistry Chemical Physics

HCl adsorption on ice at low temperature: a combined X-ray absorption, photoemission and infrared study†

Philippe Parent,*a   Jérôme Lasne,a   Guillaume Marcotteb  and  Carine Laffona  

* Corresponding authors

a Laboratoire de Chimie-Physique, Matière et Rayonnement, Université Pierre-et-Marie Curie (UPMC-Univ Paris 06) and CNRS (UMR 7614), 11 rue Pierre-et-Marie-Curie, 75231 PARIS CEDEX 05, France
E-mail: philippe.parent@upmc.fr

b Département de Chimie, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke J1K2R1, Canada

Abstract

The reaction of HCl on water ice provides a simple case for understanding dissociation and proton transfer in this non-optimal, incomplete solvation environment, playing a central role in atmospheric chemistry. This reaction has been repeatedly reported as thermally dependent, whereas the theoretical models predict a spontaneous dissociation. We examine the adsorption of HCl on ice at low temperature (50 K and 90 K) via a combination of near-edge X-ray absorption spectroscopy (NEXAFS) at the chlorine L-edge, photoemission (XPS and UPS), and reflection-adsorption infrared spectroscopy (FT-RAIRS). We show the complete dissociation of HCl into Cl− and H+ through 3 hydrogen bonds, predominantly by direct reaction with water (80%) and by self-solvation (20%), in full agreement with the prediction of a barrierless process.

Graphical abstract: HCl adsorption on ice at low temperature: a combined X-ray absorption, photoemission and infrared study

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Article information

DOI
https://doi.org/10.1039/C0CP02864A
Article type
Paper
Submitted
13 Dec 2010
Accepted
17 Feb 2011
First published
15 Mar 2011

Phys. Chem. Chem. Phys., 2011,13, 7142-7148

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HCl adsorption on ice at low temperature: a combined X-ray absorption, photoemission and infrared study

P. Parent, J. Lasne, G. Marcotte and C. Laffon, Phys. Chem. Chem. Phys., 2011, 13, 7142 DOI: 10.1039/C0CP02864A

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