POWDER ZEEMAN NQR STUDY ON THE ABSORPTION FORMS FOR A NUCLEAR-SPIN OF3 2 - DEPENDENCE ON THE ANGLE BETWEEN THE DIRECTIONS OF AN OSCILLATING MAGNETIC-FIELD AND A STATIC MAGNETIC-FIELD, AND OBSERVATION OF LARGEETA/

As a function of the angle between the directions of the oscillating m agnetic field and the static magnetic field, integral forms of powder Zeeman NQR spectra for a nuclear spin of 3/2 were observed. The powder Zeeman NQR spectra measured for various asymmetry parameters of the e lectric field gradient at nuclei were in good agreement with spectra o btained from computer simulations. The asymmetry parameters of the ele ctric field gradients at the Ga-69 nuclei in GaCl3 and at the Cl-35 nu clei, with one of the two kinds of electronic environment, in BCl3 wer e observed and estimated to give the values 0.85 and 0.42, respectivel y.