Abstract
A semi-rigid molecule model is used to explain both the temperature dependence of the 35Cl nuclear quadrupole resonance (NQR) frequency nu Q(T) and the spin-lattice relaxation time T1(T) in p-bromobenzene sulphonyl chloride. This paper reports measurements of T1(T) over the temperature range 80 to 285K which reflect the appearance of thermally activated semi-external modes (SEM) of the SO2Cl group, giving a strong spin-lattice relaxation for temperatures greater than 160K. The measured temperature dependence of nu Q(T) is explained by assuming the existence of two thermally activated SEM.
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