The atomic geometrics of the ordered (2x2) and (root 3x root 3)R30 degrees phases of K, Rb, and Cs on Rh(111) in comparison with Ru(0001)

被引：21
|
作者：
Schwegmann, S [1 ]
Over, H [1 ]
机构：
[1] MAX PLANCK GESELL,FRITZ HABER INST,D-14195 BERLIN,DAHLEM,GERMANY
来源：
SURFACE SCIENCE | 1996年 / 360卷 / 1-3期
关键词：
alkali metal adsorption; low energy electron diffraction; rhodium;
D O I：
10.1016/0039-6028(96)00602-4
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 local adsorption geometries of K, Rb and Cs in the (root 3x root 3)R30 degrees and (2x2) phases on a Rh(111) surface at coverages of 0.33 and 0.25 ML, respectively, are determined by analyzing LEED intensity data. For all (root 3x root 3)R30 degrees phases investigated, the three-fold hcp site is found. For the (2x2) overlayer, K remains in the hcp position, while Cs favors the on-top position. For the case of Rb-(2x2), LEED analysis suggests occupation of the unusual two-fold bridge site. Since LEED analysis of the Rb-(2x2) phase is not completely conclusive, additional experimental evidence is necessary to firmly establish this adsorption geometry.
引用
收藏
页码：271 / 281
页数：11
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