Angle-dependent ultraviolet photoelectron spectroscopy of sputter cleaned polycrystalline noble metals

被引：14

作者：

Helander, M. G. ^{[1
]}

Greiner, M. T. ^{[1
]}

Wang, Z. B. ^{[1
]}

Lu, Z. H. ^{[1
]}

机构：

[1] Univ Toronto, Dept Mat Sci & Engn, Toronto, ON M5S 3E4, Canada

来源：

APPLIED SURFACE SCIENCE | 2009年 / 255卷 / 23期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Ultraviolet photoelectron spectroscopy; Polycrystalline films; Noble metals; Sputter cleaning; Valence band spectra; Angle-resolved photoemission; SURFACE; PHOTOEMISSION; GOLD; SPECTRA; COPPER;

D O I：

10.1016/j.apsusc.2009.07.099

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Polycrystalline noble metal films are commonly used in practical applications across a variety of different fields. However, the surface electronic structure of the noble metals has primarily only been studied on single crystal substrates. In addition, sputter cleaned polycrystalline noble metal films are commonly used substrates in ultraviolet photoelectron spectroscopy (UPS) studies, but have yet to be systematically studied in terms of their photoemission anisotropy. The angle-dependence of the valence band spectra of sputter cleaned polycrystalline Au, Ag and Cu were studied using angle-resolved UPS. It is found that the photoemission is anisotropic with respect to photoelectron take-off angle. The results for Ag and Cu are in good agreement with previous reports of surface d-band narrowing in polycrystalline noble metal films. However, significant anisotropies in the d-band, s-band and Fermi edge of sputter cleaned Au are observed, which cannot be attributed to surface d-band narrowing alone. The unusual results for Au are attributed to drastic changes in the film morphology near the surface as a result of sputter cleaning. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：9553 / 9556

页数：4

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