Abstract
Abstract Population enhancement for NMR of the central transition of quadrupolar nuclei in solids is performed by using adiabatic radiofrequency sweeps of the satellite transitions. Single-resonance experiments are reported for 17 O, 23 Na, 27 Al, and 93 Nb nuclei in powders of Al 2 O 3 , NaNbO 3 , and LiNbO 3 , and in Pyrex glass. Experimental techniques using single-coil probe circuits capable of both wideband frequency sweeps and narrowband detection are presented. The combination of population enhancement with cross polarization from 27 Al to 17 O in α-Al 2 O 3 (corundum) powder is demonstrated. The sensitivity-enhancement technique is robust, with no critical parameters.
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