Rn~a spectra have been observed in AgGaS"AgGaSe"and CuGaS, using argon, krypton, and dye lasers. Of the 13 Raman-active vibrations, we have observed 12 of the modes of AgGaS"9 modes of AgGaSe2, and all the modes of CuGaS2. The modes of AgGaS~which are also infrared active are in good a~ement with the modes determined from a Kramers-Kronig analysis of the ir reflectivity. Agreement is also found with several of the transitions previously determined from the ir spectrum of CuGaS, . The intensity of the A, mode of AgGaS, and CuGaS, dominates the other Raman lines when the laser excitation is well below the band gap. A resonant interference effect decreases the intensity of this mode as the band gap is approached.
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