ELECTRIC-FIELD INHIBITION AND PROMOTION OF EXCHANGE DIFFUSION ON PT(001)

被引：50

作者：

KELLOGG, GL

机构：

[1] Sandia National Laboratories, Albuquerque

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.70.1631

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Direct observations of a Pt adatom migrating on the Pt(001) plane in the presence of an externally applied electric field show that a positive field raises, and a negative field lowers, the activation barrier for the adatom-substrate-atom exchange process. At field strengths of 1.5 V/angstrom and above, inhibition of the exchange mechanism is sufficient to change the diffusion mode from exclusively exchange displacements to a mode that includes hops. The effect of the electric field is explained by an electron-transfer process which changes the bonding of the adatom to neighboring surface atoms.

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页码：1631 / 1634

页数：4

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