Slow dynamics mapping of large-linewidth solids by a MARF spin-lock filter

A new method for T-1 rho contrast in solid-state imaging is presented. The method is based upon the addition of a T-1 rho spin-lock pulse to the standard MARF pulse sequence and is able to provide relaxation contrast in dependence either on the lock time or on the intensity of the lock field, without having effects related to the line-narrowing procedure. The results on some large-line-width solids show that T-1 rho values measured by the usual spin-lock pulse sequence agree with those measured on space-resolved lines. (C) 1997 Academic Press.