Theory of ultrasonically induced birefringence

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Abstract
An extended hydrodynamic theory of birefringence induced by ultrasonic waves in liquids composed of rigid symmetric top molecules is presented. This theory is closely related to that for HH depolarized light scattering spectra and to that of sound absorption. These phenomena involve the interactions of orientations with longitudinal or compressional modes, and the parameters that enter into the theory are the same as those involved in the corresponding theory of the interaction of orientations with shear modes, a theory which is applicable to flow birefringence and VH depolarized light scattering spectra. The theory predicts a linewidth expression for Brillouin scattering and a sound absorption coefficient for a liquid composed of anisometric molecules that differ from expressions previously derived; these expressions depend upon the frequency dependence of the rotational component of the shear viscosity but not upon the frequency dependence of the nonrotational component of the shear viscosity.