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

R. Apel, D. Farías and K.H. Rieder
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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

Surface Review and Letters (SRL), 1995, vol. 02, issue 02, 153-157

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.

Date: 1995
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DOI: 10.1142/S0218625X95000157

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