ESR Study of Paramagnetic Defects of the -irradiated Potassium Sulfate Single Crystal

[摘要] Single crystals of Potassium Sulfate (K2SO4) have been grown from the saturated solution by the evaporation method at the optimum conditions. Radiation damages in the crystal by ¥ã-irradiation of about 12 ¡¿ 106 Roentgen have given rise to paramagnetic centers or paramagnetic defects. Electron spin resonance (ESR) spectra of the centers are obtained with the X-band EPR spectrometer at room temperature. The ESR peaks of the paramagnetic species are found to be anisotropic but the peak of SO3- radical is an isotropic of Gaussian shape at g = 2.0036. A number of ESR spectra of the crystal for angular variation of the anisotropic peaks are recorded at various orientations of rotation about a, b and c crystallographic axes respectively. The g-values are calculated from the line position between anisotropic peaks and the isotropic one and then principal g-values and its direction cosines of the species are obtained by diagonalization of 9 matrix elements of the corresponding g-values. All the paramagnetic defects are identified by the characteristic principal g-values and its direction cosines.

[学科分类] 化学（综合）