RAMAN-SPECTRA OF H2S ALONG THE LIQUID-VAPOR COEXISTENCE CURVE

The nu1 isotropic Raman spectrum of H2S was studied in the dilute gas phase and in the gas and liquid phases along the saturation line (282 less-than-or-equal-to T less-than-or-equal-to T(c) = 373.4 K). The temperature and density dependence of the band shift was analysed assuming a strong resonant transfer due to dipolar interactions. A significant rotational contribution prevents a precise study of the vibrational effects on the asymmetric profile observed at rho < rho(c). A striking critical inhomogeneous broadening is observed as the critical point is approached. Some new results on the nu2 isotropic and anisotropic bands of liquid H2S are also presented.