At ultralow fields of 40nTto4μT magnetic flux density, nuclear magnetic resonance spectra of a resolution well below 1Hz were obtained, which is beyond what usually is achieved in the conventional high-field regime. The spectral resolution of our setup allows for the direct observation of the natural linewidth of distilled water. For heteronuclear systems, this enables pure J-spectroscopy in the absence of a chemical shift, with a resolution that is limited only by the natural width of the resonance lines.
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Burghoff et al. (2005) studied this question.
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