Dielectric Relaxation and Hindered Internal Rotation

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Abstract
The effect of hindered internal rotation on the dielectric relaxation in a liquid whose molecules contain two polar groups of equal size with a common rotation axis is calculated for twofold symmetric cosine and parabolic potential barriers. The dielectric properties are calculated from the configuration space distribution function which is obtained by a perturbation expansion of a differential equation resulting from a rotational Brownian motion argument. The results are combined with a similar calculation involving an asymmetric potential to interpret the effects of symmetry, barrier height, and barrier shape on the relaxation process.

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