Studies of a New ESR Center in X-Irradiated CaF_2 Crystals
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概要
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Electron spin resonance studies have been carried out on x-irradiated CaF_2 single crystals. A new ESR center is induced with x-irradiation at room temperature. This new ESR canter exhibits well resolved super hyperfine structures. The ESR spectrum is analysed with a spin Hamiltonian H=gβH・S+Σ^^8__<i=1>S・a_iI_i, with s=1/2 and I_i=1/2. The obtained spin Hamiltonian parameters are g=2.0007, |a_s|=10.6 and |a_p|=1.8 gauss. The ESR center grows larger with x-irradiation time and its growth is saturated after irradiation of about 4 to 5 hours. The thermal decays of the ESR center are well approximated with the first order kinetics, and its activation energy is determined as E=0.47±0.05 eV. The optical bleachings of the ESR center were also made in the range from 398 to 658nm, and ESR signals were reduced most prominently at 580nm.
- 社団法人日本物理学会の論文
- 1974-01-15
著者
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Sumita M
Department Of Natural Science Faculty Of Engineering Shibaura Institute Of Technology
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Sumita M
Department Of Electronics Engineering The University Of Electro-communications
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Sumita Minoru
University Of Electro-communications
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NAKATA Ryohei
University of Electro-Communications
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HIGUCHI Eiichi
Tokyo Institute of Polytechnics
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KOHNO Katsuyasu
University of Electro-Communications
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