Modifying the adsorption characteristics of water on Ru{0001} with preadsorbed oxygen

M. J. Gladys, A. A. El-Zein, A. Mikkelsen, J. N. Anderson, and G. Held
Phys. Rev. B 78, 035409 – Published 3 July 2008

Abstract

The coadsorption of water and preadsorbed oxygen on Ru{0001) was studied by synchrotron-based high-resolution x-ray photoelectron spectroscopy. A dramatic change was observed in the interaction of water with oxygen between low and high oxygen precoverages. Low oxygen coverages below 0.18 ML induce partial dissociation, which leads to an adsorbed layer of H2O and OH. Around half the oxygen atoms take part in this reaction. All OH recombines upon heating to 200 K and desorbs together with H2O. Oxygen coverages between 0.20 and 0.50 ML inhibit dissociation, instead a highly stable intact water species is observed, which desorbs at 220 K. This species is significantly more stable than intact water on the clean surface. The stabilization is most likely due to the formation of hydrogen bonds with neighboring oxygen atoms. For intermediate oxygen coverages around 0.18 ML, the dissociation behavior depends on the preparation conditions, which points toward possible mechanisms and pathways for partial dissociation of water on Ru{0001}.

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  • Received 28 January 2008

DOI:https://doi.org/10.1103/PhysRevB.78.035409

©2008 American Physical Society

Authors & Affiliations

M. J. Gladys1,4, A. A. El-Zein1, A. Mikkelsen2, J. N. Anderson2, and G. Held1,3

  • 1Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
  • 2Department of Physics, Lund University, Lund, Box 1118, S-221 00, Lund, Sweden
  • 3Department of Chemistry, University of Reading, Whiteknights, RG6 6AD, United Kingdom
  • 4School of Mathematical and Physical Sciences, University of Newcastle, Callaghan, NSW 2308, Australia

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Issue

Vol. 78, Iss. 3 — 15 July 2008

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