Relaxation Processes in NQR Multiple-Pulse Spin-Locking Academic Article uri icon

abstract

  • A theory o f the spin-lattice and spin-spin relaxation processes in quadrupole spin systems with / > 1/2 in the situation o f the multiple-pulse NQR spin locking is proposed for the pulse sequence MW-4. The theory is based on the assumption that for t ^ T2 the change o f the spin system is a quasi-equilibrium process. Rate equations for inverse generalized temperatures are obtained and the kinetic coefficients calculated for the case o f exponential correlation functions. The above assumption was confirmed for some substances containing the 35C1 and 123Sb, and the time constant T]e characterizing the spin echo signal decay was investigated and compared with the time constant T, in the case o f continuous spin locking.

publication date

  • January 1, 1986