Zeeman Quadrupole Spectra in p-dichlorobenzene and p-chlorobenzoic Acid

抄録

Zeeman effects of nuclear quadrupole resonance of p-dichlorobenzene and p-chlorobenzoic acid were studied. For p-chlorobenzoic acid only one C-C1 bond direction was observed. The molecular orientation against the crystal c-axis was obtained by the x-ray measurement. The asymmetry parameter was determined from the Zeeman effect to be 8%. For p-dichlorobenzene, the molcular orientation of the α phase to the β phase was studied. In most crystals examined the orientation in two phases is defined respectivey. However, there is no relation in two phases. The orientation may be restricted by dislocations which exist previously in single crystal. The obtained value of the asymmetry parameter is 6% which is smaller than Dean’s.