Abstract
The lineshape of a double-quantum (dq) nuclear magnetic resonance absorption of 23Na in a single crystal of NaNO 3 at room temperature has been plotted using a steady-state double-resonance technique. This lineshape has been compared with that of the 23Na (single-quantum) center line resonance plotted using the same technique. Both resonances were found to have the same second moment, although the theoretical dipolar second moment of the dq resonance is approximately half that of the center line. No explanation for the discrepancy has been found. Subsidiary experiments have shown that the amplitude of the dq resonance measured with different rf field amplitudes at different crystal orientations is in agreement with a BPP-type theory.
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