AN ORDERED MIXED STRUCTURE FORMED BY RESTRUCTURING TYPE COADSORPTION OF NaAND K ON Ag(001)

Seigi Mizuno (), Masao Imaki and Hiroshi Tochihara
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Seigi Mizuno: Department of Molecular and Material Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Masao Imaki: Department of Molecular and Material Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Hiroshi Tochihara: Department of Molecular and Material Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan

Surface Review and Letters (SRL), 2001, vol. 08, issue 06, 653-659

Abstract: Coadsorption of Na and K on Ag(001) at room temperature has been studied by low energy electron diffraction (LEED). A3 × 3LEED pattern was observed irrespective of the order of adsorption. For this formation, it is necessary to deposit Na and K atoms with appropriate coverage. We have determined the3 × 3structure by a tensor LEED analysis. It is a restructured surface and is very similar to the previously determined3 × 3structure formed on Ag(001) by pure Na adsorption. In the coadsorption, Na and K atoms occupy preferable sites selectively, and construct an ordered mixed structure on Ag(001). That is, small Na atoms are located in the missing row sites, while large K atoms sit on the hollow sites of four-Ag-atom islands. The reason for the site selectivity of Na and K atoms in the mixed3 × 3structures is discussed.

Date: 2001
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DOI: 10.1142/S0218625X01001580

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