L. Vandam et al., MULTIPLE-QUANTUM PULSED GRADIENT NMR DIFFUSION EXPERIMENTS ON QUADRUPOLAR (I-GREATER-THAN-1 2) SPINS/, Chemical physics letters, 262(6), 1996, pp. 737-743
The implementation of the multiple-quantum (MQ) versions of the PGSE a
nd LED pulsed field-gradient NMR diffusion experiments is described fo
r the coherence order 21 for isolated quadrupolar (spin I) nuclei in a
nisotropic systems. The MQPGSE and MQLED experiments are capable of me
asuring slow diffusion accurately, the latter also in the case of fast
transverse relaxation. Signal-to-noise ratios are discussed, and the
methods are experimentally demonstrated for Li-7(+) (J = 3/2) in an or
iented sample of DNA fibers.