The spectral dependence of the refractive indices and birefringence of CdSxSe1−x (including CdS and CdSe) single crystals has been investigated from the fundamental absorption edge up to the lattice vibration spectrum in the temperature interval 100 to 600 °K. In the region of v > 5000 cm−1 the measurements are carried out by the method of prism (with an absolute error for n of 5 × 10−4), for v < 5000 cm−1 by the modified interference method (with an absolute error for n of 5 × 10−3, and for Δn = ne − no of (2 to 4) × 10−5). The results are discussed.

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Free Carrier Absorption in CdS,Se,,, Single Crystals BY M. P. LISITSA (a), Z. A. DEMIDENKO (b), V. N. MALINKO (a), E. V. PIDLISNYI (a), M. YA. VALAKH (a), and N. I. VITRIKHOVSKII (a) Free electron absorption in single crystals of CdS and CdSe, as well as in CdS,Sel-, solid solutions ( r = 0.80, 0.58, 0.43, 0.36, 0.31, 0.21), has been investigated at Hall concentrations N = 2 x 10l6 to 2 x loL9 cm-3 in the temperature interval T = 80 to 450 OK. For all the saniples investigated, absorption coefficients K -A", where n = f ( N , T ) , and a mixed mechanism of scattering by optical phonons and charged impurities is found, whereas for N of the order of 1016 ~r n -~ scattering occurs practically only by optical phonons. An interpretation of the wavelength and concentration dependences of the measured absorption Coefficients is given. ~CC.TIe;[OBaHO IIOrJIOIIJeHHe CBeTa C B O f i O~H b I M M 3JIeKTpOHaMH B MVHOKPHCTaJIJIaX CdS, Case, TaKiKe €3 CMeJlIaHHblX MOHOKpMcTaJIJIaX CdS,Sel-, (X = 0,s; 0,58; 0,43; 0,%; 0,31 II 0,zl) IIpH XOJIJIOBCKIIX KOHUeHTPaUHRX = 2 X CM-3 Ro 2 X loi9 C K 3 B TeMIIepaTypHOM MHTepBaJIe T = 80 K O 450 "H. AJIR BCeX HccJIeno-BaHHbIX 06' beKTOB K -An, n = f(Lv, T ) , MMeeT MeCTO CMeIUaHHbIB MeXaHM3M CM-3 -IIpaHTLZ9eCHH TOJlhIEO Iia OIITPI9eCKHX $OHOHaX. AaHa TpaKTOBKa CIIelrTpaJILHOih PI IIOHUeHTpaQMOIiHOih 3aBHCIIMOcTCL? PI3MepeHIIbIX KO3@@IIuHeHTVB a paccemm Ha OrITwIecmix QomHax PI a a p~r n e~~m x IqmMecRx, n p~ M nopcrnrca normii~eHkI~.

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