Dense structures formed by CO on Rh(111)studied by scanning tunneling microscopy

被引：48

作者：

Cernota, P

Rider, K

Yoon, HA

Salmeron, M ^{[1
]}

Somorjai, G

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

来源：

SURFACE SCIENCE | 2000年 / 445卷 / 2-3期

关键词：

carbon dioxide; chemisorption; low index single crystal surfaces; rhodium; scanning tunneling microscopy;

D O I：

10.1016/S0039-6028(99)01073-0

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：

Scanning tunneling microscopy (STM) has been used to study the chemisorption of CO on a Rh(lll) single crystal surface at room temperature at coverage greater than or equal to 0.5 ML. A background pressure of CO was maintained during imaging. The structures observed include a (2 x 1) and two forms of (root 7 x root 5)R19 degrees that had not been previously observed. In contrast to the low coverage regime, above 3/7 ML, CO occupies both top and three-fold hollow adsorption sites. The highest coverage structure, (2 x 2)-3CO, was found to be stable under CO pressures of at least 700 Torr. (C) 2000 Elsevier Science B.V. All rights reserved.

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页码：249 / 255

页数：7

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