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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