EPR SPECTRA FOR γ-IRRADIATED HYDRATED DITHIONATE BARIUM SINGLE CRYSTALS
The EPR spectra were studied for hydrated dithionate barium single crystals γ-irradiated by low (80 Gr) and high (10 kGr) doses. The EPR spectra of slightly irradiated samples manifest four lines, of which the most intense one is caused by SO3- radical. The other line seems to belong to SO2-. High doses of irradiation of single crystals give rise to weak lines of hyperfine structure and pair lines of closely spaced SO3- centers exhibiting the strong angular dependence, along with the above intense line. Principal values of hyperfine SO3- interaction tensor and parameters of dipole-dipole interaction between pairs of SO3- centers were found. Quantum-chemical calculation of electron structure for isolated radicals SO3- and SO2- was carried out. Values of g tensors and hyperfine interaction were calculated