Fractal growth of LiF on Ag(111) studied by low-temperature STM

被引：8

作者：

Braun, KF ^{[1
]}

Farias, D ^{[1
]}

Fölsch, S ^{[1
]}

Rieder, KH ^{[1
]}

机构：

[1] Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany

来源：

SURFACE SCIENCE | 2000年 / 454卷 / 01期

关键词：

alkali halides; growth; scanning tunneling microscopy; silver;

D O I：

10.1016/S0039-6028(00)00178-3

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：

We studied the fractal growth of LiF on Ag(lll) at 77 K using low-temperature scanning tunneling microscopy. The observed island density as a function of the flux and the island density distribution reveal consistency with nucleation theory for the critical cluster size corresponding to i=1. The migration barrier for LIF monomers was estimated to be of the order of several tens of meV. The ramified (100)-oriented LiF aggregates exhibit a fractal dimension of d=1.75+/-0.01. No shape transition to dendritic growth was observed for fluxes ranging from F=2.4 x 10(-2) to F=2.0 x 10(-5) ML s(-1) which is attributed to the different symmetries of adsorbate and substrate. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：750 / 754

页数：5

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