“…The nuclear spin couplings are formulated by second-rank tensors, which are most usefully represented in terms of a spherical basis, as opposed to the more familiar rectangular Cartesian coordinates (see Appendix). Here, we mainly emphasize 2 H NMR spectroscopy as an illustration of the application of NMR methods to liquid-crystalline systems and molecular solids. ,,,,, −,− ,, Because a single electric quadrupolar interaction is dominant, the influences of magnetic dipolar interactions and chemical shielding are minimal. Moreover, the quadrupolar interaction is intramolecular, so that the effects of intermolecular interactions can be largely bypassed.…”