Nuclear magnetic spin-lattice relaxation and molecular motion in solid white phosphorus and in liquid phosphorus

摘要: The 31P spin-lattice relaxation rates have been measured in solid white phosphorus and liquid over the temperature range 110 K to 400 at Larmor frequencies of 10 MHz 30 MHz. contributions rate from different interactions separated. In low-temperature, crystalline phase there are important anisotropic chemical shielding intramolecular dipole-dipole which modulated by reorientational motion molecule. Interference effects between these two interactions, liquids, demonstrated be quenched strong dipolar solid. correlation time is given anisotropy high-temperature, plastic-crystalline as obtained separated other ...