Core electron energy loss spectroscopy of cerium: Surface oxidation
- 1 April 1984
- journal article
- Published by American Vacuum Society in Journal of Vacuum Science & Technology A
- Vol. 2 (2) , 826-830
- https://doi.org/10.1116/1.572516
Abstract
Core electron excitations of clean Ce and of Ce exposed to varying amounts of oxygen and H2O have been studied by electron energy loss spectroscopy (ELS) in reflection geometry. The valence change of Ce atoms during surface oxidation with oxygen is well reflected in ELS of core levels. 4d→4f excitations provide the best spectral fingerprint of the valence state, but 3d→4f and 4p→5d excitations also show spectral modifications which can be correlated to the change in f count. The spectral profiles of core level excitations of a CeO2-like oxide phase are discussed in terms of screening effects on the core hole–excited electron final states.Keywords
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