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KMID : 1059519850290020080
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Journal of the Korean Chemical Society
1985 Volume.29 No. 2 p.80 ~ p.87
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ESR Study on Paramagnetic Defects of the γ-irradiated Ammonium Sulfate Single Crystal
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Yo Chul-Hyun
Kim Eun-Ok
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Abstract
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Radiation damage in a single crystal of ammonium sulfate caused by γ-irradiation at room temperature has given rise to several paramagnetic centers. Electron spin resonance (ESR) spectra of crystal are obtained with the X-band EPR spectrometer at room temperature. An intense and isotropic peak of Gaussian shape at g = 2.0036 is assigned to SO3-, which shows power saturation effects. Angular dependence of spectra is studied for the rotations about three mutually perpendicular axes a, b and c. The g-values are obtained from the relative distances between isotropic peak of SO3- and anisotropic peak of the species. Principal g-values and direction cosines were calculated by diagonalizing the 3×3 matrix whose elements are the g-values for each species. From the analysis of characteristic principal g-values and direction cosines for ammonium sulfate single crystal, anisotropic peaks corresponding to SO4-, SO2- and defect structure corresponding to electron excess type are identified.
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KEYWORD
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