From scientific reports paper "Observing short-range orientational order in small-molecule liquids", from 2022:

"Looking at the relaxation of proton spin magnetization on a molecule can provide information about the motions of individual molecules, such as rotations/reorientations (R) and translational self-diffusion (SD), as well as of the correlated molecular reorientations of groups of molecules. In the case of elongated molecules, R can take place about the long or short molecular axis. Collective motions are correlated over a distance that is usually referred to as the coherence length. Dynamic processes take place on different time scales, ranging from picoseconds for individual motions to milliseconds for collective motions in ordered phases of liquid crystals."