Quadrupole and Proton Spin-Lattice Relaxation in the Nematic Liquid Crystalline Phase

Abstract

Abstract Measurements of the quadrupole and proton spin-lattice relaxation times, T 1, in selectively deuterated terephthalbis-(4-amino-fluorobenzene)as well as proton relaxation in other compounds are compared with a calculation for T 1 which recognizes molecular reorientations in addition to the collective order fluctuations. Further, spin-lattice relaxation times in the rotating frame have been measured in p-methoxybenyzlidene-p′-butylanilineto determine the effect of an applied magnetic field on spin-lattice relaxation. These measurements, made at a constant spin-locking field strength, are found to be independent of the strength of the applied magnetic field up to 10 kG.