Improving Resolution in Surface NMR by Transmitting Off-Resonance

An important development providing improved resolution in surface NMR images has been the advent of the inversion of complex NMR signals (Braun et al., 2005), instead of an amplitude only inversions. The signal phase is generally attributed only to conductivity effects, and a secondary geophysical survey is used to characterize the subsurface conductivity structure allowing the phase to be well constrained in the inversion. We propose a novel strategy for data acquisition motivated by similar reasoning as studies demonstrating improved resolution through inversion of a complex signal.