Cd1-xFexSe room-temperature reflectivity in the 10-25 eV energy range

The reflectivity spectra of Cd1-xFexSe (x=0, 0.07 and 0.14) have been measured in the energy range 10-25 eV and structures have been assigned to transitions from the Cd 4d and Se 5s states to the conduction bands. The assignment has been supported by theoretical ab-initio calculations of the band structure and the optical properties of pure hypothetical zincblende CdSe. The band structure and the density of states have been obtained using the self-consistent relativistic LMTO method. The theoretical spectrum has been calculated with the inclusion of k-dependent transition matrix elements. The energy shifts of the maxima as the Fe concentration increases have been discussed.