ADSORPTION SITE CHANGE FORCs,RbORKADSORPTION ONAg(111)

P. Kaukasoina, M. Lindroos, G. S. Leatherman and R. D. Diehl
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P. Kaukasoina: Physics Department, Tampere University of Technology, PO Box 692, 33101, Tampere, Finland
M. Lindroos: Physics Department, Tampere University of Technology, PO Box 692, 33101, Tampere, Finland
G. S. Leatherman: Physics Department, Penn State University, University Park, PA 16802, USA
R. D. Diehl: Physics Department, Penn State University, University Park, PA 16802, USA

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1215-1219

Abstract: The adsorption geometries for the primitive(3×3), (2×2)and ($\sqrt{3}\times\sqrt{3}{\rm R}30^\circ)$structures of K, Rb and Cs on Ag(111) have been determined using low-energy electron diffraction. In the lower-coverage(3×3)and(2×2)structures, the adatoms occupy fcc hollow sites, while in the$(\sqrt{3}\times\sqrt{3}){\rm R}30^\circ; structure they occupy the hcp hollow sites. The fcc hollow structures are accompanied by significant substrate rumpling. There is no significant coverage-dependent or site-dependent change in chemisorption bond length. However, there is a large coverage-dependent anisotropy of vibrational amplitude of the adatoms, with the parallel component as much as five times larger than the perpendicular component at low coverages.

Date: 1997
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DOI: 10.1142/S0218625X97001565

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