Abstract
Phenol, twenty-one phenol derivatives, two phenol-OD derivatives and three thiophenols all exhibit dielectric relaxations at low temperatures in dilution in hydrocarbon media. The relative relaxation rates throughout the series correlate well with published microwave and far-infrared spectroscopic data. The rates vary slowly with temperature up to about 40 K and thereafter rapidly. From the variation of the relaxation strength of 4-methyl-2,6-di-tert-butyl phenol between 3.5 mK and 750 mK the tunnel-splitting of the ground torsional state is found to take values ranging from 100 MHz to 800 MHz. At the lowest temperatures the mean relaxation rate (but not the relaxation strength) has an unexplained field dependence in remarkably small ac measuring fields.
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