Substitutional adsorption geometry for Pb(111)-(√3x√3)R30°-K

被引：6
|
作者：
Pan, FM
Caragiu, M
Ferralis, N
Diehl, RD [1 ]
机构：
[1] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
[2] Penn State Univ, Inst Mat Res, Davey Lab 104, University Pk, PA 16802 USA
[3] Ohio No Univ, Dept Phys, Ada, OH 45810 USA
来源：
SURFACE SCIENCE | 2006年 / 600卷 / 03期
基金：
美国国家科学基金会;
关键词：
low energy electron diffraction (LEED); surface structure; adsorption;
D O I：
10.1016/j.susc.2005.10.053
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：
Intermixed structures for alkalis (larger than Li) on close-packed substrates have previously been observed only on Al(1 1 1). This study shows that K forms an ordered intermixed structure on Pb(1 1 1). The structures of clean Pb(1 1 1) and Pb(1 1 1)(root 3 x root 3)R30 degrees-K were studied using dynamical low-energy electron diffraction (LEED). The clean Pb(1 1 1) surface at 47 K was found to be a relaxed version of the bulk structure, in agreement with an earlier study of the same surface [Y.S. Li, F. Jona, P.M. Marcus, Phys. Rev. B 43 (1991) 6337]. At room temperature, adsorption of K on this surface results in a (root 3 x root 3)R30 degrees structure, which was shown using dynamical LEED to consist of K atoms substituted in surface vacancies. The K-Pb bond length was found to be 3.62 +/- 0.3 angstrom, with no significant change to the Pb interlayer spacings. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：537 / 541
页数：5
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