Low-temperature STM investigation of acetylene on Pd(111)

被引：22
|
作者：
Matsumoto, C
Kim, Y
Okawa, T
Sainoo, Y
Kawai, M
机构：
[1] RIKEN, Wako, Saitama 3510198, Japan
[2] Gakushuin Univ, Dept Phys, Toshima Ku, Tokyo 1718588, Japan
[3] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778651, Japan
来源：
SURFACE SCIENCE | 2005年 / 587卷 / 1-2期
关键词：
scanning tunneling microscopy; low temperature; acetylene; palladium; rotation; adsorption site;
D O I：
10.1016/j.susc.2005.04.058
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 of individual acetylene molecules at a Pd(111) surface has been studied with scanning tunneling microscopy (STM) at 4.7 K. The adsorbed acetylene molecules appear in the STM images as a combination of a protrusion and a pair of depressions. To determine the adsorption site and configuration of the molecule, we performed rotational manipulation of the molecule by injecting tunneling electrons into the molecule as well as performing atomically resolved STM imaging. The STM images revealed that the molecules have a total of six equivalent adsorption orientations on Pd(111), indicating three equivalent rotational states on two (both fee and hcp) 3-fold hollow adsorption sites. From the atomically resolved STM images of the surface with a monatomic step edge, we have distinguished the two types of 3-fold hollow sites and confirmed that the fee site is more stable than the hcp site at a low temperature. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：19 / 24
页数：6
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