SURFACE SELF-DIFFUSION ON PT(001) BY AN ATOMIC EXCHANGE MECHANISM

被引：355
|
作者：
KELLOGG, GL
FEIBELMAN, PJ
机构：
[1] Sandia National Laboratories
来源：
PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 26期
关键词：
D O I：
10.1103/PhysRevLett.64.3143
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Field-ion microscopy has been used to map the surface sites visited by an individual Pt adatom migrating at 175 K on the Pt(001) plane and to determine its activation energy for surface diffusion. Atomic displacements are found to occur only in the [100] or [010] directions. A surprisingly low activation energy of 0.47 eV is measured. These results are consistent with a model in which the diffusion occurs by an adatom-substrate exchange mechanism. This mechanism is predicted theoretically for self-diffusion on Al(001). © 1990 The American Physical Society.
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页码：3143 / 3146
页数：4
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