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Название: Depolarized Light Scattering from Liquids: Rotations, Collisions, and Hydrodynamics
Автор: Kivelson D.
VH depolarized light scattering from liquids composed of symmetric top molecules is discussed. The dielectric fluctuations which give rise to the spectrum form an orientational and collisional (or intermolecular) contribution, and cross-correlation between the two can occur. The problem of disentangling the orientational from the collisional effects is shown to be possible, at least within the context of a generalized hydrodynamic model, because of the coupling of rotations and intermolecular interactions to hydrodynamic shear modes. A simple generalized hydrodynamic model is proposed which is successful in describing the observed spctra with an appropriate number of theoretical transport coefficients treated as adjustable parameters. Though this model is quite successful, and though the coefficients can all be described in physically meaningful and mathematically precise molecular terms, it must still be taken as a phenomenological theory until the fitted values of the coefficients can be compared with values calculated from the molecular expressions.