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

Abstract

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.

Keywords

References

  1. Nature v.201 P.N. Moorthy;J.J. Weiss
  2. J. Chem. Soc. P.W. Atkins;M.C.R. Symons;H.W. Wardale
  3. J. Chem. Soc. no.A M.B.D. Bloom;R.S. Eachus;M.C.R. Symons
  4. J. Korean Chem. Soc. v.25 no.6 C.H. Yo;J.I. Hong;E.O. Kim;J.S. Yang
  5. J. Phys. U.S.S.R v.9 no.211 E. Zavoisky
  6. Electron Spin Resonance Elementary Theory and Practical Applications J. E. Wertz;J.R. Bolton
  7. J. Magn. Resonance v.1 N. Hariharan;J. Sobhandri
  8. Mol. Phys. v.17;18 N. Hariharan;J. Sobhandri
  9. J. Phys. Soc. Japan v.22 K. AiKi;K. Hukuda
  10. J. Phys. Soc. Japan v.30 I. Suzuki;R. Abe
  11. Proc. Phys. Soc v.73 D. S. Schonland
  12. Electron Spin Resonance in Chemistry P.B. Ayscough
  13. J. Phys. Chem. Solids v.28;29 C. L. Aseltine;Y.W. Kim
  14. Introcluctiorn to Magnetic Resonance A. Carrington;A.D. McLachlan
  15. J. Natur. Sci. Res. Inst. v.3 C.H.Yo;W.Y. Chung;M.S. Pyon;J.S. Choi