Energy bands and soft x-ray absorption and emission in cuprous chloride

The observed X-ray (Cl^-L₂₃) absorption and emission spectra are compared with spectral intensities calculated with the help of energy bands in CuCl. The interpretation of the absorption spectrum puts in evidence the formation of the core excitons in addition to the usual band to band transitions. In the case of emission spectrum, the effect of correlation on the core levels seems to be an important contribution.