Abstract
Abstract Raman scattering in isotopic mixtures of hydrogen chloride (HCl) and deuterium chloride (DCl) is analysed to prove recent theories by Bratos & Tarjus and Logan on vibrational line broadening in disordered phases. The concentration dependence (mole fraction x) of isotropic and anisotropic line shapes has been studied near the triple point of both, the liquid and the solid. It has been found that the isotropic line shape is much more sensitive of isotopic composition than the anisotropic one. It is not possible to explain the extraordinary x-dependence of the broadening of the isotropic line without reference to the cross contribution between the environmental broadening and the intermolecular resonance coupling. The non-linearity of the x-dependence of the broadening indicates the activity of the three-particle resonant transfer.
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