ESR Study on Paramagnetic Defects of the $gamma$-irradiated Ammonium Sulfate Single Crystal

${\gamma}$-선에 조사된 황산 암모늄 단결정의 상자성 결함에 관한 전자스핀공명 연구

  • Yo Chul Hyun (Department of Chemistry, Yonsei University) ;
  • Kim Eun Ok (Laboratoire de Chimie du Solide du C.N.R.S., Universite de Bordeaux)
  • 여철현 (연세대학교 이과대학 화학과) ;
  • 김은옥 (프랑스 Bordeaux 1 대학 고체화학연구실)
  • Published : 1985.04.20


Radiation damage in a single crystal of ammonium sulfate caused by ${\gamma}$-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 $SO_3^-$, 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 $SO_3^-$ and anisotropic peak of the species. Principal $g^-$values and direction cosines were calculated by diagonalizing the 3${\times}$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 $SO_4^-,\;SO_2^-$ and defect structure corresponding to electron excess type are identified.



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