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E. Lundgren, J. Gustafson, A. Resta, J. Wissenrieder, A. Mikkelsen, J.N. Andersen, L. Köhler, G. Kresse, J. Klikovits, A. Biedermann, M. Schmid, P. Varga:
"The surface oxide as a source of oxygen on Rh(111)";
Journal of Electron Spectroscopy and Related Phenomena, 144-147 (2005), 367 - 372.

The reduction of a thin surface oxide on the Rh(1 1 1) surface by CO is studied in situ by photoemission spectroscopy, scanning tunneling
microscopy, and density functional theory. CO molecules are found not to adsorb on the surface oxide at a sample temperature of 100 K, in
contrast to on the clean and chemisorbed oxygen covered surface. Despite this behavior, the surface oxide may still be reduced by CO, albeit
in a significantly different fashion as compared to the reduction of a phase containing only chemisorbed on surface oxygen. The experimental
observations combined with theoretical considerations concerning the stability of the surface oxide, result in a model of the reduction process
at these pressures suggesting that the surface oxide behaves as a source of oxygen for the CO-oxidation reaction.
© 2005 Elsevier B.V. All rights reserved.
Keywords: PES; DFT; STM; Rh; O; CO

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