Abstract
Abstract The manipulation of spin-state populations is investigated for quadrupolar nuclei with pulsed and frequency-swept RF fields. The frequency-sweep method is an effective way to interchange the populations of two levels and does not require exact knowledge of the transition frequency. Results for allowed (Δ m = 1) and forbidden transitions (Δm > 1) are reported for 27 Al in a single crystal Al 2 O 3 . The behavior of the higher-order transitions establishes a lower limit for the sweep rate for sensitivity enhancement of the central transition for powders and amorphous solids.
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