The double resonance spectra of N14 and N15 ammonium ion are in good agreement with the spectra calculated with a Hamiltonian that is made stationary by transformation to a rotating coordinate system. No effects of cross relaxation are apparent. Terms in the interaction of the strong radio frequency field with the proton magnetic moment, and off-diagonal elements in the nitrogen-proton spin-spin coupling can be neglected. The effects of sweeping magnetic field rather than frequency permit a very accurate measurement of the nitrogen resonance frequency, and the ratio of the N15 and N14 magnetogyric ratios.
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John D. Baldeschwieler (1962) studied this question.
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