%0 Journal Article
%T Two-dimensional single- and multiple-quantum correlation spectroscopy in zero-field nuclear magnetic resonance.
%A Sjolander TF
%A Blanchard JW
%A Budker D
%A Pines A
%J J Magn Reson
%V 318
%N 0
%D Sep 2020
%M 32759044
%F 2.734
%R 10.1016/j.jmr.2020.106781
%X 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.