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The Infrared and Raman study of lattice vibrations of the chalcopyrite compound CuAlSe 2 with a complete assignment of the lattice vibrational modes is reported. Each two modes of E symmetry and one mode of B 2 symmetry have been found in the high frequency (from 250 to 400 cm -1 ), medium frequency (from 160 to 200 cm -1 ) and low frequency (from 60 to 120...