Cl35 Pure Quadrupole Resonance Studies of Relaxation Times in Solid Solutions of p-Dichlorobenzene

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Abstract
Transient methods have been used to measure the Cl35 nuclear relaxation times at room temperature in solid solutions of p‐dichlorobenzene and p‐dibromobenzene. The spin‐lattice relaxation time T1 and the phase memory time T2 were found to be virtually independent of sample composition. However, the inverse line width T2* decreases very sharply from 3.1×10—4 sec in pure p‐dichlorobenzene to 0.15×10—4 sec in a sample with 20 mole percent p‐dibromobenzene. Thus, the main effect of the solute molecules is to broaden the absorption line by producing a distribution in the electric field gradients at the chlorine nuclei. Mechanisms for the T1 and T2 results are discussed.

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