Electron spin resonance of gamma-irradiated K2S2O5 single crystals

Abstract

The electron spin resonance (ESR) spectra of ?-irradiated potassium pyrosulfite single crystals have been investigated between 300 and 103 K temperature interval. The signals were attributed to three SO3- and a SO2- radicals, we found to be temperature dependent. The SO3- radicals were found to be inequivalent. The presence of three SO3- radicals is not consistent with the monoclinic structure of K2S2O5 single crystal and this is attributed to any misadjustment of the orientations of SO3- radicals to fit the crystal structure after irradiation. Elements of the g and hyperfine tensors of 33S nuclei with natural abundance of 0.74% for SO3- and SO2- radicals were determined. For two SO3- radicals, the g and hyperfine values in a plane perpendicular to a axis of the crystal were found to be equal below 193 K, while they are different at room temperature. This reversible effect can be attributed to structural phase transition.The electron spin resonance (ESR) spectra of ?-irradiated potassium pyrosulfite single crystals have been investigated between 300 and 103 K temperature interval. The signals were attributed to three SO3- and a SO2- radicals, and found to be temperature dependent. The SO3- radicals were found to be inequivalent. The presence of three SO3- radicals is not consistent with the monoclinic structure of K2S2O5 single crystal and this is attributed to any misadjustment of the orientations of SO3- radicals to fit the crystal structure after irradiation. Elements of the g and hyperfine tensors of 33S nuclei with natural abundance of 0.74% for SO3- and SO2- radicals were determined. For two SO3- radicals, the g and hyperfine values in a plane perpendicular to a axis of the crystal were found to be equal below 193 K, while they are different at room temperature. This reversible effect can be attributed to structural phase transition.