Abstract
Depolarization properties of Raman spectra of simple liquids have been studied experimentally by decomposing them into polarized (s-wave) and depolarized (d-wave) components. For quantum liquids, 3He and 4He, the ratio of the polarized component to the total intensity has been observed to increase in the large energy shift region. Pressure dependence has been measured both for super and normal fluid 4He. For liquid 4He, the integrated intensity ratios of the s-wave component to the d-wave component have been estimated and found to increase with increasing pressure. The values of the ratios for 4He are consistent with the theoretical values by Campbell et al. For Ne, we have observed weak polarized component in the large energy shift region, but the contribution of the polarized intensity to the total intensity is smaller compared with those of quantum liquids. For Ar, the ratio of polarized component to the total intensity is even weaker than that of Ne. Existence of the polarized component suggests that the repulsive interaction is also important to investigate the Raman scattering process of simple liquids as well as conventional dipole-induced-dipole interaction. Relative contribution of the polarized component to the total intensity has been found to decrease as a liquid loses quantum nature.
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