LETTERS TO THE EDITOR Frequency dependence of the relative permittivity of polar substances
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A study of the Brownian motion of a dipolar molecule surrounded by a dispersive dielectric medium has resulted in the following generalization of Onsager's equation ( - ∞)(2* + ∞)(2 + 1)/3(2* + 1) = (4πNμ2/3kTV)((∞ + 2)2/9)(1/(1+iωτμ')) where τμ' is a microscopic relaxation time which includes the effect of dipole-dipole coupling.
[1] R. Zwanzig. Dielectric Relaxation in a High‐Temperature Dipole Lattice , 1963 .
[2] L. Onsager. Electric Moments of Molecules in Liquids , 1936 .