Observation of microscopic CO dynamics on Cu(001) using 3He spin-echo spectroscopy -: art. no. 156103

被引：38

作者：

Alexandrowicz, G ^{[1
]}

Jardine, AP ^{[1
]}

Fouquet, P ^{[1
]}

Dworski, S ^{[1
]}

Allison, W ^{[1
]}

Ellis, J ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.93.156103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present momentum resolved measurements of quasielastic helium atom scattering made using a new He-3 spin-echo spectrometer. Our data for the dynamics of CO on Cu(001) indicates an activated jump mechanism which we analyze in detail using molecular dynamics simulations. A nearly isotropic potential energy surface is found with an average barrier height of similar to125 meV, yielding comparable hopping rates along both the <110> and <100> directions. The measurements provide the first rigorous experimental test of state-of-the-art first-principles calculations previously made on this system.

引用

页码：156103 / 1

页数：4

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