3A04 PFG-NMRによるスメクティック相の異方的自己拡散係数

抄録

Pulsed field gradient spin echo NMR spectroscopy has been developed to measure anisotropic self-diffusion coefficients. By using a rotatable quadrupole coil and a magic angle orientation technique, the anisotropic self-diffusion coefficients were measured in the smectic A phases of several liquid crystals. Activation energies were determined for each of the diffusion coefficient components, parallel and perpendicular to the director. Dipole moments of the individual molecules were calculated with the MOPAC7 program.