Abstract
A method for accurately measuring the initial portion of an NMR free induction decay, including a point at t = 0, is described in some detail. Theoretical calculations justifying the technique are carried out. The technique uses spin locking, and is limited to single crystals. The results of free induction decay shape measurements using a single 90° pulse and those using the present technique are found to be identical to within experimental error for 19F in CaF 2 (representing a rigid lattice) and PbF 2 (representing a motionally narrowed lattice).
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