Journal
SURFACE SCIENCE
Volume 566, Issue -, Pages 486-491Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2004.05.089
Keywords
synchrotron radiation photoelectron spectroscopy; chemisorption; rhodium; hydrogen atom; low index single crystal surfaces
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The interaction of hydrogen with the Rh(1 1 1) surface was studied by means of high-resolution real-time X-ray core-level photoemission. The analysis of the intensity of the Rh3d(5/2) core-level components was used to determine the hydrogen adsorption sites as a function of the hydrogen dose. While at low coverage only three-fold adsorption sites are occupied, at higher hydrogen concentrations bridge species are also present. The temperature dependence of the core-level spectra indicates that during desorption, surface depopulation occurs in an almost reverse order with respect to the adsorption process. (C) 2004 Elsevier B.V. All rights reserved.
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