NQR STUDIES OF MOLECULAR MOTIONS BETWEEN UNEQUAL POTENTIAL WELLS IN ACRYSTAL

The behavior of nuclear quadrupole spin-lattice relaxation in reorient ational motion of molecules between potential wells in a three-well po tential field with one deep and two identical shallow wells is studied theoretically. The relaxation process in this case is shown to be one -exponential if the potential-well depths differ by a value exceeding the thermal energy RT. As an analysis of the results shows, the temper ature dependence of the observed time of spin-lattice relaxation cause d by molecular reorientations furnishes information about the higher p otential barrier in the three-well potential considered. Application o f the obtained results to interpretation of experimental data is discu ssed.