Direct observation of subsurface oxygen on Rh(111)

被引：61
|
作者：
Wider, J [1 ]
Greber, T [1 ]
Wetli, E [1 ]
Kreutz, TJ [1 ]
Schwaller, P [1 ]
Osterwalder, J [1 ]
机构：
[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland
来源：
SURFACE SCIENCE | 1998年 / 417卷 / 2-3期
关键词：
rhodium; subsurface oxygen; surface structure; X-ray photoelectron diffraction; X-ray photoemission spectroscopy;
D O I：
10.1016/S0039-6028(98)00674-8
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：
A Rh(111) surface has been exposed to oxygen under conditions that favour the formation of a subsurface oxygen species. After exposure to 10(5) L O-2 at a surface temperature of 470 K X-ray photoelectron diffraction data of O Is emission reveal that (5+/-2)% of a monolayer of oxygen atoms occupy octahedral interstitial sites just underneath fcc adsorption sites. The occupation of such a site forces the oxygen atoms adsorbed in its close vicinity to switch from the stable fcc Site to the hcp adsorption site. Implications of this finding for the interpretation of temperature-programmed desorption spectra, as well as for the catalytic behaviour of the oxidized Rh(lll) surface, are discussed. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：301 / 310
页数：10
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