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LEED STRUCTURE ANALYSES OF THE CLEAN AND FULLY HYDROGEN-COVEREDW(110)andMo(110)SURFACES

Author

Listed:
  • M. ARNOLD

    (Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91 058 Erlangen, Germany)

  • S. SOLOGUB

    (Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91 058 Erlangen, Germany;)

  • G. HUPFAUER

    (Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91 058 Erlangen, Germany)

  • P. BAYER

    (Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91 058 Erlangen, Germany)

  • W. FRIE

    (Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91 058 Erlangen, Germany)

  • L. HAMMER

    (Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91 058 Erlangen, Germany)

  • K. HEINZ

    (Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91 058 Erlangen, Germany)

Abstract

We present a comparative low energy electron diffraction (LEED) structure analysis for the clean as well as hydrogen-saturated (110) surfaces of tungsten and molybdenum. Both clean surfaces exhibit some contraction of the first interlayer spacing, i.e.-3.1%for W and-4.0%for Mo, whereas deeper layer distances remain practically bulklike. The only structural consequence of a hydrogen monolayer adsorbed is the reduction of the first interlayer distance contraction to approximately half its value of the clean surface, i.e. to-1.7%for W and-2.0%forMo. Our results give no evidence for an adsorbate-induced reconstruction of either surface and thus discard the widely accepted model of a hydrogen-induced lateral shift of the top layer ofW(110). Hydrogen itself is found to be adsorbed in threefold-coordinated hollow sites at a height of about 1.2 Å and 1.1 Å above the first substrate layer ofWandMo, respectively.

Suggested Citation

  • M. Arnold & S. Sologub & G. Hupfauer & P. Bayer & W. Frie & L. Hammer & K. Heinz, 1997. "LEED STRUCTURE ANALYSES OF THE CLEAN AND FULLY HYDROGEN-COVEREDW(110)andMo(110)SURFACES," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 4(06), pages 1291-1295.
    • Handle: RePEc:wsi:srlxxx:v:04:y:1997:i:06:n:s0218625x97001693
    DOI: 10.1142/S0218625X97001693
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