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

X. Chen, T. Abukawa, J. Tani and S. Kono
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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

Surface Review and Letters (SRL), 1995, vol. 02, issue 06, 795-804

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.

Date: 1995
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DOI: 10.1142/S0218625X95000728

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