Electronic structure and orientation of benzene adsorbed on a pseudomorphic Cu monolayer on Ru(0001)

被引：13
作者：
Koschel, H
Held, G
Steinrück, HP [1 ]
机构：
[1] Univ Erlangen Nurnberg, D-91058 Erlangen, Germany
[2] Univ Wurzburg, Wurzburg, Germany
来源：
SURFACE SCIENCE | 2000年 / 454卷 / 01期
关键词：
benzene; copper; ruthenium; thermal desorption spectroscopy;
D O I：
10.1016/S0039-6028(00)00097-2
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 benzene on a pseudomorphic Cu monolayer on Ru(0001) was studied by temperature-programmed desorption and angle-resolved UV photoelectron spectroscopy in combination with symmetry selection rules. Benzene is molecularly adsorbed on the pseudomorphic Cu monolayer on Ru(0001). Desorption of the first layer occurs in the temperature range between 155 and 340 K. In contrast to the clean Ru(0001) surface, no decomposition is observed upon heating. The analysis of the binding energies of the molecular benzene levels reveals a significant bonding shift of 1.1 eV of the benzene pi levels, which is nearly as large as the value of 1.4 eV for the strongly chemisorbed saturated benzene layer on Ru(0001). The benzene molecules are azimuthally oriented with the C-H bonds aligned along the [10 (1) over bar 0] direction. This geometry corresponds to an azimuthal rotation of 30 degrees as compared to that on the clean Ru(0001) surface. (C) 2000 Elsevier Science B.V. All rights reserved.
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页码：83 / 87
页数：5
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