STEP-FACILITATED DISSOCIATION OF SMALL METAL-CLUSTERS - A MOLECULAR-DYNAMICS STUDY

被引:10
作者
LI, YG
RAEKER, TJ
DEPRISTO, AE
机构
[1] IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011
[2] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011
来源
PHYSICAL REVIEW B | 1994年 / 50卷 / 19期
关键词
D O I
10.1103/PhysRevB.50.14742
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The motion of small Pt clusters at a step edge on the Pt(111) surface was studied by molecular-dynamics simulations using the corrected effective-medium theory. It was found that interlayer diffusion of the clusters proceeds via dissociation and consecutive single-atom exchanges with the edge atoms, rather than hopping over the edge as a unit. The dissociation and the exchanges occur in a coherent way. We therefore propose that surface defects, like steps or large vacancy pits, may facilitate cluster dissociation via incorporation of the cluster atoms into the edges. © 1994 The American Physical Society.
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页码:14742 / 14745
页数:4
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