Remarkably long-ranged repulsive interaction between adsorbed CO molecules on Pt modified Ge(001)

被引：11

作者：

Kockmann, Daan ^{[1
]}

Poelsema, Bene ^{[1
]}

Zandvliet, Harold J. W. ^{[1
]}

机构：

[1] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 24期

关键词：

adsorption; carbon compounds; germanium; molecule-surface impact; platinum;

D O I：

10.1103/PhysRevB.78.245421

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the adsorption of CO molecules on a Pt modified Ge(001) surface at 77 K. The CO molecules preferentially adsorb on the self-organized Pt chains rather than on the terraces. We have identified two different adsorption sites at 77 K: one either on the short-bridge site or on top of one of the atoms of a buckled Pt dimer, and the other one on the long-bridge site in between two Pt dimers. The CO molecules are mobile at room temperature but immobile at 77 K. A statistical analysis of the nearest-neighbor spacing of the CO molecules reveals that adsorbed CO molecules interact repulsively along the Pt-dimer chains. This repulsive interaction, composed of electrostatic terms and a strain-mediated term, gradually fades away over, for simple molecules, a remarkably long distance of 3-4 nm.

引用

页数：5

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