HREELS Studies of Hydrogen Adsorption on Pd(311)

P. Schilbe, D. Farías and K. H. Rieder
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P. Schilbe: Paul-Drude-Institut Berlin, Hausvogteiplatz 5-7, D-10117 Berlin, Germany
D. Farías: Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
K. H. Rieder: Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

Surface Review and Letters (SRL), 1998, vol. 05, issue 02, 473-478

Abstract: The adsorption of hydrogen on Pd(311) at 100 K has been investigated by high resolution electron energy loss spectroscopy (HREELS). The observed vibration energies are similar to former values reported on low index Pd surfaces, which allowed relating the vibration modes with the different adsorption sites on the (311) surface. In contrast to Ni(311) and Rh(311), hydrogen adsorption is found to begin at the fourfold-coordinated instead of the threefold-coordinated sites. The latter sites are occupied only at coverages greater than 0.5 ML. The hydrogen adsorption behavior on Pd(311) seems to be ruled by the possibility of occupying threefold and fourfold sites and by the H–H repulsion.

Date: 1998
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DOI: 10.1142/S0218625X98000840

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