Nuclear Magnetic Relaxation and Dielectric Relaxation in Isoamyl Bromide

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Abstract
Nuclear magnetic spin—lattice relaxation times have been measured for supercooled isoamyl bromide at 20 and 60 Mc/sec over the temperature range 113° to 300°K. A distributed correlation function is introduced in order to explain the data. An expression for T1 which fits the data within the experimental error is obtained by using the Cole—Davidson distribution function to distribute the Kubo and Tomita expression for T1. Both the cutoff correlation time of the distribution function and the width parameter are allowed to vary with temperature. These parameters are compared with those reported in the literature from an analysis of the dielectric relaxation of supercooled isoamyl bromide using the Cole—Davidson distribution function. Similarities in the distribution function cutoff times and differences in the width parameters are observed. The distribution function parameters are related to molecular and liquid structure. Measurements of spin—spin relaxation times at 20 Mc/sec are discussed briefly.

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