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Dielectric loss in the 0.3 to 140 GHz range, and to some extent dispersion, of seven selected aliphatic chain molecules, substituted by Cl, Br, and I at both ends have been measured in dilute solutions of n-heptane, benzene, and decalin. Chain length varied from 3 to 10 carbon atoms. For 1,10-dichlorodecane in decalin and mesitylene the temperature was also varied from -30 to + 60 °C. The unsymmetric absorption curves have been resolved in a weak FIR region and a predominant region with a symmetric relaxation time distribution (log. scale) according to Fröhlich. The width of this distribution is shown to be independent of chain length and halogen. Its mean relaxation time increases linearly with chain length, while the dipole moment goes through a minimum for the butyl compounds.

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Dielektrische Relaxation von aliphatischen Kettenmolekülen mit endständigen Halogen-Gruppen in verdünnter Lösung / Dielectric Relaxation of α, ω-Halogen Alkanes in Dilute Solution