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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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The vibrational properties of Zn,Cdl -,Se phonons are studied using Raman scattering. The change of the LO-phonon spectrum versus crystal composition is found to be of the one-mode type. The TO-phonon behaviour is much more complicated. It exhibits rather anomalous features in the line shape and TO-mode frequency versus crystal composition as well as temperature. The above phenomena are interpreted in terms of the anharmonic coupling between TO-mode and twophonon states. This coupling is well described by the theory developed. aKClIepHMeHTaJIbH0 HCCneAOBEiHbI ClIeKTpbl HOM6MHaQMOHHOrO paCCeRHMR MOHOKpMCTaJl-JIOB Zn,Cdl -,Se. &TIFi LO-@OHOHOB YCTaHOBJIeH O n H O M O~O B b l f i XapaKTep IlepeCTpO&U4 ClIeKTpa C COCTBBOM. AJIR TO-@OHOHOB KapTHHa M3MeHeHMR CIleXTpOB CyUeCTBeHHO 6onee CJIOWHaR. 06HapyHCeHHbIe OCO6eHHOCTH 3aBHCHMOCTM YaCTOTbI, MHTeHCMBHOCTH M (POPMbI IIOJIOCbI TO-(POHOHOB OT COCTaBa M TeMIlepaTypbI 06yCnOBJIeHbI aHraPMOHHYeCKHM B3aMMOAefiCTBMeM HX C ~BYX(POH0HHbIMH B036YXEAeHMRMH aKyCTMqeCIEMX (POHOHOB. Pa3-BMTaFI TeOpMR TaKOrO B3aKMOAefiCTBMR XOpOIUO OllHCbIBaeT BCe er0 KaYeCTBeHHbIe OCO-6eHHOCTH.