Surface double layer on (001) surfaces of alkali halide crystals: A scanning force microscopy study

被引：58

作者：

Barth, Clemens ^{[1
]}

Henry, Claude R. ^{[1
]}

机构：

[1] CNRS, CRMCN, F-13288 Marseille 09, France

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 13期

关键词：

CHLORIDE SINGLE-CRYSTALS; IONIC SUBLIMATION; CHARGE; DIFFUSION; MECHANISM;

D O I：

10.1103/PhysRevLett.98.136804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter we consider the surface double layer on (001) surfaces of UHV cleaved and annealed alkali halide crystals (KCl, NaCl), which we studied with dynamic scanning force microscopy and Kelvin probe force microscopy. Kelvin images show bright and round patches at corner sites and steps. Images with atomic resolution always show kinks at the latter step sites. Our findings are in perfect agreement with the long-standing picture that, due to the presence of divalent impurity ions, the surface carries a net negative surface charge originating from negative cation vacancies at kinks.

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页数：4

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