Reflection spectra of phosphides in the residual beams region

We studied, both experimentally and theoretically, the IR reflectance spectra (obtained using polarized radiation) of phosphides ZnSiP2, ZnP2 and CdP2. When calculating spectra, we applied our model for permittivity with allowance made for contributions from the phonon and plasmon subsystems. The electrophysical parameters of the above single crystals were obtained. The effect of variation of free charge carrier concentration on the reflection spectra of ZnSiP2, ZnP2 and CdP2 was studied