The CuGaSe2 ternary compound crystallizes in the chalcopyrite structure (CH) with space group D2d ( l a d ) . The unit cell volume of the structure is twice the volume of the cubic one, with the Brillouin zone being four times smaller than that of the corresponding zincblende (ZB) structure. As a result, the symmetry points r, X, and W of the ZB Brillouin zone transform into r of CH. tional modes, determined by the degrees of freedom, is 24 /lA the acoustic ones are classified according to the irreducible representations 12 With the primitive cell containing two formula units, the number of vibrarac = B~ + E and optical ones r0@ = %(It)+ 2% + 3B1(R)+ 3B2(I& R)+ 6E(IR R).The purpose of the present note is to study the Raman spectra of CuGaSe2 single crystals. The infrared (IR) reflection spectra of CuGaSe2 single crystals were investigated from 150 to 400 cm" in /2/.The CuGaSe2 single crystals grown by vapour transport /3/ had m i r r o r surfaces corresponding to the (112) crystallographic plane. The CuGaSe2 single crystals being opaque in the visible spectral range (E = 1.6 eV), a continuously operating YAG:Nd3+ laser (hu = 1.16 eV) was used for exciting the Raman spectra. A DFS-12 spectrometer with 600 lines/mm standard diffraction gratings in the first order of diffraction was used as a monochromator. A FEU-83 photomultiplier cooled down 6y liquid nitrogen vapour was used as a detector. The apparatus provided Raman spectra of CuGaSe2 single crystals in the frequency range from 20 to 300 cm" in the most convenient transmission geometry. g 1) Podlesnaya 17, 220726 Minsk, USSR.
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