Electron spin resonance of gamma-irradiated K2S2O5 single crystals

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI:10.1016/1359-0197(92)90140-B

Recep Tapramaz, Fevzi Köksal

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引用次数: 1

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 K₂S₂O₅ 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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伽玛辐照K2S2O5单晶的电子自旋共振

研究了γ辐照焦亚硫酸钾单晶在300 ~ 103 K温度区间内的电子自旋共振(ESR)谱。这些信号被归因于三个SO-3和一个SO-2自由基，并且发现它们与温度有关。SO-3自由基是不相等的。三个SO-3自由基的存在与K2S2O5单晶的单斜结构不一致，这是由于辐照后SO-3自由基的取向与晶体结构相适应造成的。测定了so3和so2自由基自然丰度为0.74%的33S核的g和超精细张量元素。在193 K以下，两个SO-3自由基在垂直于晶体轴线的平面上的g值和超细值相等，而在室温下则不同。这种可逆效应可归因于结构相变。

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International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry

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