THE STRUCTURE OF AL(111)-K-(ROOT-3 X ROOT-3) R30-DEGREES DETERMINED BY LEED - STABLE AND METASTABLE ADSORPTION SITES

Authors
STAMPFL C BURCHHARDT J NIELSEN M ADAMS DL SCHEFFLER M OVER H MORITZ W
Citation
C. Stampfl et al., THE STRUCTURE OF AL(111)-K-(ROOT-3 X ROOT-3) R30-DEGREES DETERMINED BY LEED - STABLE AND METASTABLE ADSORPTION SITES, Surface science, 287, 1993, pp. 418-422
Citations number
22
Categorie Soggetti
Chemistry Physical
Journal title
Surface science → ACNP
ISSN journal
00396028
Volume
287
Year of publication
1993
Part
A
Pages
418 - 422
Database
ISI
SICI code
0039-6028(1993)287:<418:TSOAXR>2.0.ZU;2-V
Abstract
It is found that the adsorption of potassium on Al(111) at 90 K and at 300 K both result in a (square-root 3 x square-root 3)R30-degrees str ucture. Through a detailed LEED analysis it is revealed that at 300 K the adatoms occupy substitutional sites and at 90 K the adatoms occupy on-top sites; both geometries have hitherto been considered as very u nusual. The relationship between bond length and coordination is discu ssed with respect to the present results, and with respect to other qu antitative studies of alkali-metal/metal adsorption systems.