Interference effects in NMR correlation spectroscopy of coupled spin systems

Abstract

The nonlinear behavior of coupled spin systems in NMRcorrelation spectroscopy is studied theoretically and experimentally. The two principal types of effects result from passage with transverse interference and from passage with longitudinal interference. The phase and relative amplitude of the signals strongly depend upon the applied sweep rate and the effective flip angle utilized in these experiments. Specific examples are cited for the case of coupled two‐spin systems. Guidance for avoiding nonlinear interference effects in NMR correlation experiments is indicated.