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E. I. LEONOV (c), V. M. ORLOV (c), V. A. CHALDYSHEV (b), and A. SILEIKA (a)The electroreflectance spectra of CdSnP, chalcopyrite single crystals have been investigated in the spectral region 1.0 to 4.7 eV at room temperature using polarized light. The electroreflectance structure in the region of the fundamental absorption edge and its polarization dependence are found to be in good agreement with the relative location of the valence bands earlier predicted theoretically. A great number of electroreflectance peaks has been observed in the spectral region 2.4 to 4.7 eV and interpreted by optical transitions at the I?, T, and N points of the Brillouin zone of the chalcopyrite lattice. The only transitions used were direct ones and responsible for the main structure in the optical spectra of sphalerite crystals. In addition, the fine structure of these optical transitions due to crystal field splitting has been included. npeHCTaBjIeHbI pe3yJIbTaTbI HCCJleAOBaHIIH CIIeIETpOB 3JIeHTPOOTPaHEeHHR MOHO-KpHCTaJIJIOB CdSnP, B IIOJIRpI130BaHHOM CBeTe B CIIeIFTpaJIbHOfi o6nac~H OT 1 ,o A 0 4,7 3B IIpH KOMHaTHOfi TeMIIepaType. CpTyHTypa CIIeKTpOB 3JIeKTpOOTpaHEeHIIR B o 6 n a c~~ OCHOBHOrO KpaR IIOrJIO~eHHR El ee IIOJIHpH3alJHOHHaR 3aBHCIIMOCTb IlOATBePAHJIU paHee TeOpeTHqeCKH IIpenCKa3aHHyIO CTPYKTYPY BaJleHTHOfi 30HbI. MHOHl eCTBO IIHHOB 3JIeHTpOOTpaHEeHUR B CIleHTpaJIbHOfi obnac~I1 OT 2,4 A0 4,7 3B XOpOluO HHTepIlpeTHpyeTCR OIITHqeCKUMH IIepeXOHaMH B TOqKaX r, T H N 3 0 H H EpHJIJIlO3Ha XaJlbKOIIUpHTa) 6blBIIIEIMH IlPRMbIMH H B C@aJIepHTe, IIpU YqeTe HX T O H H O~ CTPYICTYP~I BcneficTBm IipmTannmecKoro pacuenneHm, 0 6 y c n o~n e~-Horo ne@opMamiefi II HanmHeM HBYX COPTOB KaTHoHoB B pelue-me CdSnP,. 29

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