Abstract
We have used photoelectron spectroscopy techniques [UPS (ultraviolet) and XPS (x ray)] to study the electronic structure of Au and Ag overlayers deposited on Pt(100), Pt(111), and Pt(997). Between 0 and 1 monolayer, the valence bands of Au and Ag show changes in the form of shifts of the most tightly bound peaks and the appearance of new structures around a coverage monolayer. The Au peak shifts 0.6 eV towards higher binding energies when varies from 0.1 to 1 monolayer and 0.5 eV more when varies from 1 to 6 monolayers. In the case of Au on Pt(100) a shallow minimum in the work function around monolayer is observed. The core levels of Au on Pt(100) shift also to higher binding energy as increases. From monolayer the shift is 0.6 eV and from monolayers additional 0.4-eV shift is observed. These shifts are explained as due to the changing contributions of the Au atoms in island edges for surface () and bulk () coordination positions.
- Received 1 July 1983
DOI:https://doi.org/10.1103/PhysRevB.28.6758
©1983 American Physical Society