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

Maik Arnold, S. Sologub, G. Hupfauer, P. Bayer, W. Frie, L. Hammer and K. Heinz
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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

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1291-1295

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.

Date: 1997
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DOI: 10.1142/S0218625X97001693

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