Hydrogen adsorption and diffusion on Pd(111)

被引：120

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.

引用

页码：5 / 11

页数：7

共 22 条

[1] Energetics and vibrational states for hydrogen on Pt(111) -: art. no. 136101 [J].