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CHEMISORPTION SITE DETERMINATION OF HYDROGEN IN THE SYSTEMc(1×1)H/Rh(311)EMPLOYINGHe-DIFFRACTION

Author

Listed:
  • R. APEL

    (Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 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)

Abstract

He-beam diffraction data evaluated for cleanRh(311)yield a best-fit corrugation, which shows a pronounced corrugation amplitude along the (100)-microfacets and a practically vanishing amplitude along the (111)-microfacets in agreement with expectation, but in contrast toNi(311)where the reverse situation was found. Hydrogen adsorption leads to a sequence ofc(1×1), c(1×3), p(1×1), c(1×3), andp(1×1)RECphases. The fact that thec(1×1)phase was observed with He-diffraction, but not in previous LEED studies, again proves the exceptional sensitivity of He scattering for adsorbed hydrogen. Surface charge density calculations were performed to reproduce the shape and amplitude of the best-fit corrugation function of thec(1×1)H-phase.In this way we found that the H atoms occupy places between the topmost bridge sites and the adjacent threefold hollow sites on the (111)-microfacets; the H-Rh bond length amounts to1.92±0.1 Å.

Suggested Citation

  • R. Apel & D. Farías & K.H. Rieder, 1995. "CHEMISORPTION SITE DETERMINATION OF HYDROGEN IN THE SYSTEMc(1×1)H/Rh(311)EMPLOYINGHe-DIFFRACTION," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 2(02), pages 153-157.
    • Handle: RePEc:wsi:srlxxx:v:02:y:1995:i:02:n:s0218625x95000157
    DOI: 10.1142/S0218625X95000157
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