Coadsorption of H and CO on Gd(0001)

被引：3
|
作者：
Getzlaff, M
Bode, M
Wiesendanger, R
机构：
[1] Univ Hamburg, Inst Appl Phys, D-20355 Hamburg, Germany
[2] Univ Hamburg, Microstruct Res Ctr, D-20355 Hamburg, Germany
来源：
APPLIED SURFACE SCIENCE | 1999年 / 142卷 / 1-4期
关键词：
hydrogen; carbon monoxide; gadolinium; adsorption; photoelectron spectroscopy; scanning tunneling microscopy;
D O I：
10.1016/S0169-4332(98)00642-4
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：
We report on the electronic structure of hydrogen and carbon monoxide on Gd(0001) and the development of the adsorption processes studied by means of photoelectron spectroscopy in combination with scanning tunneling microscopy. The adsorption process of a hydrogen covered Gd film being exposed to carbon monoxide consists of five steps. At the beginning the whole amount of adsorbed hydrogen atoms is removed from the surface. In the intermediate regime, carbon and oxygen is adsorbed at or near the surface. The last step demonstrates the oxidation to Gd2O3 acting as a catalyst for the transformation of CO to CO2 which creates stable carbonate species at the surface. This formation occurs also for the adsorption of oxygen and carbon monoxide. The visualization of the adsorption process during specific steps is obtained by STM. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：428 / 432
页数：5
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