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DYNAMICAL ANALYSIS OF X-RAY PHOTOELECTRON DIFFRACTION FROMW(001)c(2×2)-AgAND -AuSURFACES

Author

Listed:
  • X. CHEN

    (Research Institute for Scientific Measurements, Tohoku University, Sendai 980–77, Japan)

  • T. ABUKAWA

    (Research Institute for Scientific Measurements, Tohoku University, Sendai 980–77, Japan)

  • J. TANI

    (Research Institute for Scientific Measurements, Tohoku University, Sendai 980–77, Japan)

  • S. KONO

    (Research Institute for Scientific Measurements, Tohoku University, Sendai 980–77, Japan)

Abstract

The local structures ofW(001)c(2×2)-Agand -Au[refer to asc(2×2)-Agand -Au] surfaces have been studied by x-ray photoelectron diffraction (XPD) forAg-3dandAu-4femissions with both multiple-scattering and single-scattering cluster approaches. Our dynamical study has revealed that the outermost layers of these surfaces form rumpled alloy structures, and the height of adsorbate atoms is0.3±0.1 Åabove that of W atoms in the top layer, and both adsorbate and tungsten atoms are at fourfold symmetric sites on the surfaces. It is also found in this study that there is a strong multiple-scattering effect on these surfaces, and a kinematical analysis fails completely on XPD from thec(2×2)-Agsurface at a high kinetic energy of 1115 eV, where the validity of the single-scattering theory was taken for granted in the past. Conditions that may result in such a strong multiple scattering in the systems are discussed in this paper.

Suggested Citation

  • X. Chen & T. Abukawa & J. Tani & S. Kono, 1995. "DYNAMICAL ANALYSIS OF X-RAY PHOTOELECTRON DIFFRACTION FROMW(001)c(2×2)-AgAND -AuSURFACES," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 2(06), pages 795-804.
    • Handle: RePEc:wsi:srlxxx:v:02:y:1995:i:06:n:s0218625x95000728
    DOI: 10.1142/S0218625X95000728
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