Coverage dependence of K adsorption on Si(100)2×1 by core-level photoemission: Structure, charge transfer, and metallization
- 15 February 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (7) , 3532-3537
- https://doi.org/10.1103/physrevb.45.3532
Abstract
Using core-level photoemission, a coverage-dependent transition in the adsorption of K on Si(100)2×1 is observed. Below ∼0.25 monolayers, a single adsorption is occupied, the asymmetry of the Si-dimer reconstruction is enhanced, and no more than ∼0.05e is transferred from K to Si. Above this coverage, multiple sites are occupied, the dimer configuration becomes more symmetric, and the K overlayer becomes increasingly metallic. These findings resolve a number of conflicting studies of this system.Keywords
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