Abstract
The effects of screening in the core-level photoemission spectra of mixed-valence compounds are studied with the use of an Anderson-model formulation. The mixed-valent ground-state properties and core-hole Green's function are calculated with the use of a decoupling approximation. The relative weights of peaks corresponding to two different configurations ( and ) are found to become appreciably different from the ground-state valence due to shakedown as the hybridization between the localized -level and conduction electrons is increased. The discrepancy is estimated to be of the order of , where is the correlation energy between the core hole and electron, and represents the hybridization between electron and conduction electrons. We also find a shakedown peak in this limit. From a comparison of ground-state valence with the measured intensity of the shake-down peak for Ce, the width of the level due to hybridization is estimated to be of the order of 1 eV, in agreement with a recent resonant photoemission measurement.
- Received 8 March 1982
DOI:https://doi.org/10.1103/PhysRevB.26.2085
©1982 American Physical Society