UC Berkeley

We present single- and multiple-quantum correlation J-spectroscopy detected in zero (<1μG) magnetic field using a ⁸⁷Rb vapor-cell magnetometer. At zero field the spectrum of ethanol appears as a mixture of ¹³C isotopomers, and correlation spectroscopy is useful in separating the two composite spectra. We also identify and observe the zero-field equivalent of a double-quantum transition in ¹³C₂-acetic acid, and show that such transitions are of use in spectral assignment. Two-dimensional spectroscopy further improves the high resolution attained in zero-field NMR since selection rules on the coherence-transfer pathways allow for the separation of otherwise overlapping resonances into distinct cross-peaks.