A continuum mechanics theory of depolarized and polarized Rayleigh-Brillouin light scattering spectra of supercooled liquids

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Abstract
On the basis of a constitutive equation appropriate for linear viscoelastic liquids, a continuum mechanics theory has been developed to consistently describe the polarized and depolarized light scattering spectra of viscoelastic liquids consisting of anisotropic molecules. The theory introduces the effect of the translation-rotational coupling in the hydrodynamic equations. It is shown that such a coupling results in reducing of the dynamic shear viscosity, the reduction of the dynamic shear viscosity thus makes the bulk viscosity dominant in determining the isotropic light scattering spectrum. The results are useful for interpreting the dynamic light scattering spectra of viscous and supercooled liquids.