Structure of Electron Transitions of Corundum

The integral spectra of the dielectric permeability of corundum within the region 8–40 eV in the polarizations E C and E C are decomposed into 18 Lorentz elementary oscillators. Their principal parameters, namely, the energy E_i, halfwidth H_i, band area S_i, and height of the maximum _2max, are calculated and the main features are established. An analysis of the wellknown results obtained by two models of the reproduction of the ₂ spectra with the aid of a large number of fitting parameters and theoretical calculations of the corundum bands is carried out.