EPR Study of Gamma-Irradiated Na2S2O3·5H2O Single Crystals

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<inf>2</inf>O-, SO<inf>2</inf>-, S<inf>2</inf> O<inf>2</inf>-, SO<inf>3</inf>- and S<inf>2</inf> O<inf>3</inf>-. Each radical has shown two magnetically distinct sites in monoclinic lattice. The angular variation of EPR spectra has also shown that both S<inf>2</inf>O- and S<inf>2</inf> O<inf>2</inf>- radicals have two groups and each of that has two distinct sites. The principal g values for each site have been calculated. © 2008 Elsevier Ltd. All rights reserved.