Abstract
The effects of higher-rank multipoles on the spectral lineshape of I = 52 and 72 quadrupolar nuclei have been examined near the null point in the inversion-recovery measurements. 27Al (I = 52) and 133Cs (I = 72) NMR inversion-recovery experiments were performed in D2O/glycerol-d8 solutions. The longitudinal and transverse relaxational matrix elements using state multipole formalism for spin-52, -72, and -92 have been derived. It is found that the null-point spectra of spin-52, -72, and -92 are similar to those of the spin-32 system. This indicates that the direct coupling between rank-one and rank-three elements plays the key role in the generation of fine structure in null-point spectra.
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