The influence of tip-sample interaction on step fluctuations on Ag(111)

被引：17

作者：

Mugele, F ^{[1
]}

Rettenberger, A ^{[1
]}

Boneberg, J ^{[1
]}

Leiderer, P ^{[1
]}

机构：

[1] Univ Konstanz, Fak Phys, D-78457 Konstanz, Germany

来源：

SURFACE SCIENCE | 1998年 / 400卷 / 1-3期

关键词：

low index single crystal surfaces; scanning tunneling microscopy; silver; surface diffusion;

D O I：

10.1016/S0039-6028(97)00843-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The fluctuations of the position of monatomic steps on Ag(ll1) are investigated by scanning tunneling microscopy (STM). We analyze the influence of tip-sample interaction by varying the gap impedance over more than two orders of magnitude. For tunneling tips providing a weak tip-sample interaction. wt show that the step position autocorrelation Function remains essentially unaltered. In this unperturbed case, the kinetics of step fluctuations are found to be dominated by one-dimensional mass transport. For larger variations of the rip-sample distance or for less favorable tip configurations. we observe a tip-induced increase of the step fluctuations. Our measurements suggest that this effect is caused rather by short-range Forces than bq the electric field in the tunneling gap. (C) 1998 Elsevier Science B.V.

引用

页码：80 / 86

页数：7

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