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We have obtained the low-frequency dispersion of Im X((3)) in CS(2) by stimulated Raman gain technique with a simple low-power cw-pulsed laser system. The theoretical relationship between the nonlinear spectrum and the spontaneous spectrum is confirmed. The unique capability of the technique for low-frequency Raman measurements is well demonstrated with the detection of a weak near-zero-frequency mode.
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Scarparo et al. (1981) studied this question.
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