Microwave Absorption and Molecular Structure in Liquids. LXIII. Dielectric Behavior of Rigid Polar Molecules at 2.2-mm Wavelength and Atomic Polarization

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Abstract
Dielectric constants and losses of fluorobenzene, chlorobenzene, bromobenzene, α‐chloro‐ and α‐bromonaphthalene, thiphene, tetrahydrofuran, and chloroform have been measured at 2.2‐mm wavelength at various temperatures between 20° and 55°C. The results have been used together with the existing lower‐frequency data to construct Cole—Cole arc plots, from which relaxation times, distribution parameters and optical dielectric constants are obtained. In all cases studied the optical dielectric constant ε∞ has a value close to the square of the refractive index nD2, and there seems to be no evidence of the additional ultrahigh‐frequency dispersion region suggested by the results of previous workers. The values of ε∞ obtained have been used to calculate atomic polarizations which generally agree well with the values determined for the molecules in the gaseous state.

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