Experimental study of cross-relaxation in multipulse NQR spin-locking

Abstract

The results are presented of an experimental study of 35Cl nuclear magnetization relaxation by multipulse NQR spinlocking in powder samples. It has been shown that the multiple-echo decay time constant T 1e in proton-containing compounds is much less than the spin-lattice relaxation time T 1. It has been established that a sharp decrease of T 1e time is due to cross-relaxation, i.e. 35Cl nuclei spin order transfer to the proton dipole reservoirs. The dependences of T 1e time on multipulse sequence parameters t c and ϕ y have been studied. The use of this method for the study of molecular structure peculiarities in crystals is proposed.