Electronic structure of single-crystal rocksalt CdO studied by soft x-ray spectroscopies and ab initio calculations

Soft x-ray emission spectroscopy (XES) and x-ray absorption spectroscopy (XAS) are employed to investigate the occupied and unoccupied electronic structures in rocksalt- phase single- crystal CdO. Resonant XES at the OK edge reveals a clear Cd 4d - O 2p hybridized peak and momentum- dependent coherent contributions to the resonant emission spectra. Good agreement is obtained between the above- threshold XES and XAS spectra, and the calculated O 2p local partial density of states ( PDOS ). Calculation of the O 2p PDOS was performed within the GW framework of many- body perturbation theory.