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)

Authors
SCHWEGMANN S OVER H
Citation
S. Schwegmann et H. Over, 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), Surface science, 360(1-3), 1996, pp. 271-281
Citations number
33
Categorie Soggetti
Chemistry Physical
Journal title
Surface science → ACNP
ISSN journal
00396028
Volume
360
Issue
1-3
Year of publication
1996
Pages
271 - 281
Database
ISI
SICI code
0039-6028(1996)360:1-3<271:TAGOTO>2.0.ZU;2-B
Abstract
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 0.3 3 and 0.25 ML, respectively, are determined by analyzing LEED intensit y data. For all (root 3x root 3)R30 degrees phases investigated, the t hree-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 brid ge site. Since LEED analysis of the Rb-(2x2) phase is not completely c onclusive, additional experimental evidence is necessary to firmly est ablish this adsorption geometry.