Leed studies of alkali metals on Ag(111) and their coadsorption with Xe
Conference
·
OSTI ID:126238
- Penn State Univ., University Park, PA (United States)
LEED studies of K, Rb and Cs on Ag(111) indicate the formation of overlayers having densities which increase continuously with submonolayer coverage. At certain coverages the structures are commensurate, but between commensurate phases the over-layers are in commensurate and in general form hexagonal layers which can be aligned along non-symmetry directions. This suggests a {open_quotes}normal{close_quotes} type of adsorption in which the adatom-adatom interactions are strong and the corrugation of the substrate potential is small but not insignificant. Xe coadsorbed with a partial layer of alkali is bound more weakly to the surface than when on clean Ag(111), as measured by Xe desorption temperatures, with the desorption temperature continuously decreasing from about 80 K on the clean surface to about 55 K near 0.8 of saturated alkali coverage. The structural observations suggest that the Xe-alkali interaction is repulsive, which is quite opposite to earlier observations on other metals and graphite.
- OSTI ID:
- 126238
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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