Valence band studies of Ag and Pd codeposited on Ru(0001)

被引：6

作者：

Bech, L.

Li, Z.

Onsgaard, J. ^{[1
]}

机构：

[1] Aalborg Univ, Dept Phys & Nanotechnol, DK-9220 Aalborg, Denmark

[2] Aarhus Univ, Inst Storage Ring Facil, DK-8000 Aarhus C, Denmark

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2007年 / 156卷

关键词：

silver; palladium ruthenium; surface alloy; valence bands; photoelectron spectroscopy;

D O I：

10.1016/j.elspec.2006.11.036

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Codeposition of Ag and Pd on the Ru(0 0 0 1) surface has been studied by photoelectron spectroscopy (PES) by recording of valence band (VB) and 3d(5/2) core electron energy distribution curves (EDCs). Two- and three-dimensional total film coverages in the temperature range 300-765 K have been characterized. At submonolayer total coverage, a flat, monolayer (ML) thick film with some degree of mixing is formed. A stable surface alloy, with Ag-Pd hybridization states similar to 2.5 eV binding energy (BE), is found when Pd is deposited after Ag. A 1 nm thick Ag52Pd48 film formed by deposition of Pd on a Ag-precovered surface at room temperature exhibits a substantial interdiffusion of Pd and Ag. A stable concentration profile is reached between 550 and 660 K. (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：102 / 106

页数：5

共 22 条

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