Proton Transfer in Solids and Surfaces

24 Aoki uses FT-IR reflection spectroscopy to monitor the transfer of protons and of water molecules from a layer of H2O ice to a layer of D2O ice as a function of time and external pressure. The H/D mutual diffusion coefficient measured at 400 K shows a monotonic decrease by two orders of magnitude as the pressure increases from 8 to 63 GPa. In order to separate molecular from protonic diffusion experiments were also carried out on H2 0 ice bilayer. 

Whereas molecular diffusion dominates under normal conditions, it is suppressed at high pressures. The protonic diffusion is assumed to take place via H3O+ and OH ions which can, however, not be observed. 

25 by Christmann is devoted to the interaction and reaction dynamics of hydrogen and simple molecules containing a hydroxy group such as water and methanol with transition metal surfaces. In particular, the possibility of H transfer via lateral diffusion or proton tunneling within the adsorbed layers is discussed. It is shown that lateral diffusion and transfer of H atoms does indeed occur via both 

Hydrogen-Transfer Reactions. Edited by J. T. Hynes, J. P. Klinman, H. H. Limbach, and R. L. Schowen Copyright 2007 WILEY-VCH Veriag GmbH Co. KGaA, Weinheim ISBN 978-3-527-30777-7 

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