The perturbing effect of magnetic field modulation in nuclear magnetic resonance under conditions of high resolution is discussed. When the modulation frequency is greater than the resonance line width, sideband resonances separated in frequency by the modulation frequency are observed, having line shapes of either absorptive or dispersive form or a mixture of the two depending on the phasing of the lock-in detector. The form and distribution of these sidebands is satisfactorily accounted for using Bloch's equations.
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Burgess et al. (1952) studied this question.
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