Abstract
The electron spin resonance (ESR) spectra of γ-irradiated potassium pyrosulfite single crystals have been investigated between 300 and 103 K temperature interval. The signals were attributed to three SO - 3 and a SO - 2 radicals, and found to be temperature dependent. The SO - 3 radicals were found to be inequivalent. The presence of three SO - 3 radicals is not consistent with the monoclinic structure of K 2S 2O 5 single crystal and this is attributed to any misadjustment of the orientations of SO - 3 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 SO - 3 and SO - 2 radicals were determined. For two SO - 3 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.
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Schedule a callMore From: International Journal of Radiation Applications & Instrumentation. Part C, Radiation Physics & Chemistry
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