Hydrogen adsorption and diffusion on Pd(111)

被引：118
|
作者：
Mitsui, T
Rose, MK
Fomin, E
Ogletree, DF
Salmeron, M
机构：
[1] Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
来源：
SURFACE SCIENCE | 2003年 / 540卷 / 01期
关键词：
hydrogen molecule; hydrogen atom; palladium; scanning tunneling microscopy; surface structure; morphology; roughness; and topography; surface diffusion;
D O I：
10.1016/S0039-6028(03)00822-7
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：
The adsorption, diffusion and ordering of hydrogen on Pd(1 1 1) was studied by scanning tunneling microscopy in the temperature range of 37-90 K. At low coverage isolated hydrogen atoms were observed. They formed root3 x root3-1H islands as the coverage increased. Above 1/3 monolayer (ML) coverage areas of a new phase with root3 x root3-2H structure were formed, with both structures coexisting between 1/3 and 2/3 ML. Finally a 1 x 1 structure was formed after high exposures of hydrogen above 50 K, with a coverage close to 1 ML. Atomically resolved images reveal that H binds to fcc hollow sites. (C) 2003 Elsevier B.V. All rights reserved.
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收藏
页码：5 / 11
页数：7
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