Reflectance spectra of ZnCr2Se4spinel from 4 to 100 eV measured with synchrotron radiation: Band structure, covalency, and final-state interactions

Abstract

Reflectance spectra of a Zn${\mathrm{Cr}}_2$ ${\mathrm{Se}}_4$ single crystal have been measured in the wavelength region from 3000 to 120 Å. Final-state interactions of the $M_{2,3}3p$ inner-core excited states of the ${\mathrm{Cr}}^{3+}$ ion have been quantitatively evaluated from the analysis of the multiplet structures in the x-ray ultraviolet (xuv) spectrum on a basis of a recently developed ligand-field theory. The vacuum ultraviolet (vuv) reflectance spectra of the spinel are interpreted for the first time by taking into account the results of band calculations and the covalency effect.