Abstract
Techniques are described for displaying NMR responses as a function of two independent frequency parameters, with particular emphasis on the presentation of carbon-13 spectra with the chemical shift information in one dimension and the proton-carbon splittings in the second dimension. The resolving power for these spin multiplets can be significantly better than in conventional NMR, since the linewidths are determined principally by spin-spin relaxation effects rather than by field inhomogeneity. Modulation is imposed on carbon-13 spin echoes by gating or pulsing the proton-irradiation field, and is analyzed by two successive stages of Fourier transformation. A theoretical analysis, confirmed by experiment, indicates that the profiles of the resulting resonances are an admixture of absorption and dispersion modes in a proportion that changes rapidly as a function of the second frequency parameter. Echoes acquired in the presence of wideband proton decoupling lead to a superposition of resonances which (in the case of weak proton-proton coupling) presents an absorption mode profile in both frequency dimensions.
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More From: Journal of Magnetic Resonance (1969)
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