The reflection spectra of cuprous halides in the 4.5–7.5 eV range

The reflection spectra of cuprous halides have been measured on cleaved samples at various temperatures from 300 K up to 6 K. The experimental device is improved by a minicomputer based data acquisition system. The appearance of structures at low temperature, the evolution of the spectra versus temperatures permit us to interprete some experimental features in terms of a band structure scheme where the valence bands are calculated in the tight binding approximation, the spin orbit splitting being introduced as a perturbation.