A Refined Leed Analysis of Water on Ru{0001}: An Experimental Test of the Partial Dissociation Model

S. R. Puisto, T. J. Lerotholi, G. Held () and D. Menzel
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S. R. Puisto: Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
T. J. Lerotholi: Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
G. Held: Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
D. Menzel: Physics Department, Technische Universität München, D-85747 Garching, Germany

Surface Review and Letters (SRL), 2003, vol. 10, issue 02n03, 487-492

Abstract: Despite a number of earlier studies which seemed to confirm molecular adsorption of water on close-packed surfaces of late transition metals, new controversy has arisen over a recent theoretical work by Feibelman, according to which partial dissociation occurs on the Ru{0001} surface leading to a mixed (H2O + OH + H) superstructure. Here, we present a refined LEED-IV analysis of the${\rm (\sqrt{3} \times \sqrt{3})R30^\circ\mbox-D_2O\mbox-Ru\{0001\}}$structure, testing explicitly this new model by Feibelman. Our results favour the model proposed earlier by Held and Menzel assuming intact water molecules with almost coplanar oxygen atoms and out-of-plane hydrogen atoms atop the slightly higher oxygen atoms. The partially dissociated model with an almost identical arrangement of oxygen atoms can, however, not unambiguously be excluded, especially when the single hydrogen atoms are not present in the surface unit cell. In contrast to the earlier LEED-IV analysis, we can, however, clearly exclude a buckled geometry of oxygen atoms.

Date: 2003
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DOI: 10.1142/S0218625X03005086

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