METASTABLE (23S) HELIUM ATOM SCATTERING FROM MOLECULAR ADSORBATES ONPdANDCuSURFACES

P. Fouquet () and G. Witte
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P. Fouquet: Max-Planck-Institut für Strömungsforschung, Bunsenstraße 10, D-37073 Göttingen, Germany
G. Witte: Ruhr-Universität Bochum, Lehrstuhl für Physikalische Chemie I, Universitätsstraße 150, D-44801 Bochum, Germany

Surface Review and Letters (SRL), 1999, vol. 06, issue 01, 103-107

Abstract: The de-excitation of metastable (23S1) He* atoms upon scattering from clean, NO- and CO-covered Cu(100) and Pd(111) surfaces has been investigated, and the He* survival probability was measured as a function of the NO and CO coverage. The corresponding adlayer structures were characterizedin situby ground state He atom scattering (HAS). The present results support an earlier interpretation of metastable de-excitation spectroscopy (MDS) data indicating a suppression of the resonance ionization (RI) de-excitation channel in the case of CO adsorption due to a screening of the metal surface by the adsorbate layer. In contrast, for NO on Pd(111) no increase of the He* survival probability was observed.

Date: 1999
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DOI: 10.1142/S0218625X99000123

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