Abstract

EPR study of gamma-irradiated sodium thiosulfate pentahydrate single crystals has been carried out at room temperature. The title compound crystallizes in monoclinic system with the unit cell parameters, a=5.94 Å, b=21.57 Å, c=7.53 Å and β=103.58°, with Z=4. The observed lines in the EPR spectra have been attributed to the species of S 2O −, SO 2 - , S 2 O 2 - , SO 3 - and S 2 O 3 - . Each radical has shown two magnetically distinct sites in monoclinic lattice. The angular variation of EPR spectra has also shown that both S 2O − and S 2 O 2 - radicals have two groups and each of that has two distinct sites. The principal g values for each site have been calculated.

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