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The dielectric relaxation behaviour of dilute solutions of tri-n-butylammonium picrate and tri-n-butylammonium iodide in o-terphenyl have been studied over a frequency range (1 to 105 Hz) in the supercooled liquid state. The ion-pairs are found to relax in this frequency range by a cooperative mechanism involving the solvent molecules, and the mechanism for this process is discussed. In addition, the thermally stimulated depolarization currents of electrets formed from the ion-pair solutions of the picrate have been studied and are shown to yield information on the motion of the ion pairs in the region of 10–2 Hz.
Davies et al. (Mon,) studied this question.