Abstract
The response of quadrupolar nuclei to finite radiofrequency (rf) pulse excitation in magic-angle spinning (MAS) NMR of powders is investigated. A theoretical description and numerical simulations show the impact of rf excitation as function of pulse width, relative strength of the rf field and quadrupole interactions, and spinning speed. The distribution of magnetization over the various multiple-quantum (MQ) transitions is examined for spin I = 3 2 and 5 2 quadrupolar nuclei. A two-pulse MQ-filtered sequence is used to explore one-pulse excitation of MQ coherences. Simulations are compared with experimental 1Q and MQ-filtered 23Na and 27Al MAS NMR spectra.
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