Abstract
The x-ray-photoelectron valence-band and inner-shell spectra of CoO are presented and interpreted using the molecular-orbital theory for the Co cluster and the sudden approximation (monopole selection rules). The spectra are shown to exhibit the effects of monopole charge-transfer shake-up (), multiplet splitting, and crystal-field splitting. The structure of Co levels in CoO () is broader than that of Ni levels in NiO (), in agreement with the energy levels of the final hole state estimated from the Tanabe and Sugano diagrams for the and configurations. Shake-up satellite structures lying 5 to 10 eV below the main peaks in the Co inner-shell and valence-band levels suggest that the CoO optical-reflectance structure at 5.5 and 7.5 eV is associated with transitions.
- Received 11 July 1974
DOI:https://doi.org/10.1103/PhysRevB.11.2177
©1975 American Physical Society