Abstract
Variations of T 2 ★ of the n.q.r. signals of 35Cl, 81Br and 127I in their p-dihalobenzenes were observed to depend on the previous history of the sample. Zonerefined samples were cooled from the melt to room temperature, XXX20°C, in two ways (a) slowly over several hours and (b) quickly over a few minutes. Samples (a) gave higher T 2 ★ values because the fewer crystal defects produced in the slowcooling process gave a more homogeneous electric field gradient. The results gave new measurements of T 2 ★ , emphasized the need for describing past history when quoting linewidth measurements and showed the importance of T 2 ★ measurements in the study of phase transitions.
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