pulsed nuclear magnetic resonance spectroscopy three-dimensional nuclear magnetic resonance spectroscopy three-dimensional NMR spectroscopy three-dimensional NMR 3D NMR three-dimensional (3D) NMR Any type of nuclear magnetic resonance spectroscopy in which three independent frequency dimensions are employed for the correlation and dispersal of signals (by employing two magnetisation transfer steps). Each signal is described by three frequencies, thus effecting the distribution of signals within a cube. 3D-NMR spectroscopy CHMO:0001070 3D-NMR 3D NMR spectroscopy