{Reference Type}: Journal Article
{Title}: Two-dimensional single- and multiple-quantum correlation spectroscopy in zero-field nuclear magnetic resonance.
{Author}: Sjolander TF;Blanchard JW;Budker D;Pines A;
{Journal}: J Magn Reson
{Volume}: 318
{Issue}: 0
{Year}: Sep 2020
{Factor}: 2.734
{DOI}: 10.1016/j.jmr.2020.106781
{Abstract}: 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.