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Experimental evidence for a partially dissociated water bilayer on Ru{0001}

By Jonas Weissenrieder, Anders Mikkelsen, Jesper Andersen, Peter Feibelman and Georg Held

Abstract

Core-level photoelectron spectra, in excellent agreement with ab initio calculations, confirm that the stable wetting layer of water on Ru{0001} contains O-H and H2O in roughly 3:5 proportion, for OHx coverages between 0.25 and 0.7 ML, and T<170 K. Proton disorder explains why the wetting structure looks to low energy electron diffraction (LEED) to be an ordered p(root3xroot3)R30degrees adlayer, even though approximate to3/8 of its molecules are dissociated. Complete dissociation to atomic oxygen starts near 190 K. Low photon flux in the synchrotron experiments ensured that the diagnosis of the nature of the wetting structure quantified by LEED is free of beam-induced damage

Publisher: American Physical Society
Year: 2004
OAI identifier: oai:centaur.reading.ac.uk:16640

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