Adsorption sites and ligand effect for CO on an alloy surface: a direct view

被引:114
作者
Gauthier, Y
Schmid, M
Padovani, S
Lundgren, E
Bus, V
Kresse, G
Redinger, J
Varga, P
机构
[1] Vienna Tech Univ, Inst Allgemeine Phys, A-1040 Vienna, Austria
[2] CNRS, Cristallog Lab, F-38042 Grenoble 09, France
[3] Brno Univ Technol, Inst Engn Phys, CZ-61669 Brno, Czech Republic
[4] Univ Vienna, Inst Mat Phys, A-1090 Vienna, Austria
[5] Tech Univ Vienna, Ctr Computat Mat Sci, A-1090 Vienna, Austria
关键词
D O I
10.1103/PhysRevLett.87.036103
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
CO adsorption on a PtCo(111) surface was studied by scanning tunneling microscopy. Comparison of images with chemical contrast of Pt and Co and images. showing the CO molecules indicates that CO resides exclusively on top of Pt sites and never on Co. CO bonding is highly sensitive to the chemical environment. The probability to find CO on a Pt atom increases drastically with the number of its Co nearest neighbors. Ab initio calculations show that this ligand effect is due to different positions of the center of the Pt d band.
引用
收藏
页码:36103 / 1
页数:4
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