Abstract
The NQR frequency ν and the spin-lattice relaxation time T1 of 35Cl nuclei in crystalline (ω,ω)-dichlorotoluene, C6H5CHCl2, have been measured at temperatures above 77 K. The existence of a second-order phase transition was discovered at Tc = 94 K. At this point the low-temperature NQR spectrum consisting of five lines passes into the high-temperature doublet. The behaviour of ν and T1 as functions of temperature near the critical point Tc is investigated and corresponding parameters are obtained. The NQR signals fade out about 185 K due to the reorientational motion with the potential barrier of 33.9 kJ/mole.
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