Macroscopic anisotropy of the molecular reorientational dynamics in nematic liquid crystals

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Abstract
The reorientational diffusion equation is solved for the case of rotational diffusion tensor D̂ depending on the instantaneous molecular orientation. New equations for the rotational contribution to the IR bands of aligned nematic mesophase taking into account also the anisotropy of the rotational viscosity are proposed and an attempt to explain the temperature dependence of the rotational diffusion coefficients D∥ and D⊥ is reported.