The refraction n and absorption Јq indices of paramagnetic .o-Cr alloys with 10, 20 and 35% chromium concentrations were measured within the spectral range 0.23 to 2.8 Јgm (0.44ЎK5.36 eV) at room temperature by spectral ellipsometric methods. Based on these data, the dielectric permittivity Ј`, optical conductivity Јm and reflection coefficient R at normal incidence were calculated. The dispersion of optical conductivity Јm(hЈh) and dispersion curves of residual optical conductivity ѓґЈm(hЈh) = Јm(hЈh)ЎV (1 ЎV c)„e
„eЈmCo(hЈh) were analyzed in detail (c ЎV Cr impurity concentration, ЈmCo(hЈh) ЎV optical conductivity of Co solvent). It has been ascertained that new impurity bands are formed in the electronic spectrum of Co solvent when Cr impurities are added, which are
responsible for the extra absorption in .o-Cr alloys. The localization of impurity energy
levels in Co-Cr alloys at 1.8ЎK2.0 eV above the Fermi level has been suggested.
