Abstract
We have used NEXAFS and photo-stimulated desorption (PSD)–NEXAFS spectroscopy at the O1s and at the Cl2p edges to study H 2O and HCl ices, as well as the adsorption of HCl on water ice. The PSD–NEXAFS provides a clear fingerprint of the dangling OH bond at the water ice surface. We evidence the H–Cl fragmentation at the 2 p→ σ ∗ (H–Cl) excitation of condensed HCl. Last, we directly observe the ionization of HCl when adsorbed on H 2O ice, both at the surface and after diffusion in the bulk of ice.
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