Photoemission spectroscopy of surfaces and adsorbates
Conference
·
· AIP Conf. Proc.; (United States)
OSTI ID:5728339
Core level photoelectron spectroscopy is providing new information concerning the electronic properties of adsorbates and surfaces. Several examples will be discussed, including studies of adsorbed rare gas submonolayers and multilayers as well as clean metal surfaces. For rare gas multilayers adsorbed on metal surfaces, the photoelectrons and Auger electrons exhibit well-resolved increases in kinetic energy with decreasing distance between the excited atom and the substrate, allowing a direct labeling of the layers. These energy shifts are mainly due to the substrate screening effects, and can be described well by an image-charge model. For a Kr/Xe bilayer system prepared by first coating a Pd substrate with a monolayer of Kr and then overcoating with a layer of Xe, a thermally activated layer inversion process is observed when the temperature is raised, with Xe coming in direct contact with the substrate. For rare gas submonolayers adsorbed on the Al(111) surface, coverage-dependent core level shift and work function measurements provide information about the adatom spatial distributions, polarizabilities, and dipole moments for the ground and excited states. The 2p core level shifts for a clean Al(001) surface relative to the bulk have also been studied. The shifts have a large contribution from the initial-state effects. 20 references, 7 figures, 2 tables.
- Research Organization:
- Univ. of Illinois at Urbana-Champaign, Urbana
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 5728339
- Report Number(s):
- CONF-820855-
- Conference Information:
- Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 94
- Country of Publication:
- United States
- Language:
- English
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