Abstract

31P spin-lattice relaxation rates have been measured in plastic crystalline white phosphorus as a function of temperature and Larmor frequency. The contributions to the measured relaxation rates from dipole-dipole, anisotropic chemical shielding and spin-rotational interactions have been separated in a consistent manner. The derived spin-rotational relaxation rate is shown to be quantitatively consistent with large angle reorientational jumps of the P 4 molecules about their C 3v axes over 120°.

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