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An improved method of determining the indirect nuclear spin coupling J in magnetic resonance by the transient method is described. The reduction of self-diffusion method is described. The reduction of self-diffusion attenuation by complex pulse trains permits the observation of J modulation for times up to about one second and measurement of J to ±1½% or better. Chemical shifts δ can also be determined. Expressions are given for the echo modulation in some special cases and also a general method for obtaining them when J <<δ. The modulation patterns in methyl alcohol, ethyl alcohol and 2-bromo-5-chloro-thiophene are given.
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Powles et al. (1961) studied this question.
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