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
收藏
页码：750 / 754
页数：5
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