Raman scattering of CuAlSe2 (at resonance excitment), CuAlS2 and CuAlxGa1-xSe2 has been investigated at 300 and 77K. The modes caused by Al - Se and Ga - Se vibrations have been determined for CuAlxGa1-xSe2 solid solutions. We have found that the intensity of the modes B12(Γ3) - 107.2 and 210.5 cm-1 increases whereas the intensity of Ε(Γ5) - 157.3 cm-1 mode decreases as the exciting energy approaches the band gap Εg.
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A. M. Andriesh, "Infrared vibrational modes and Raman scattering in CuAlS2, CuAlSe2, and CuAlxGa1-xSe2 crystals," Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27784O (1 September 1996);