Thermal Formation of F_2^+ Centers in KCl Crystals
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概要
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Thermal formation of F_2^+ centers in KCl crystals has been investigated in temperature region between 210°K and 270°K. KCl crystals containing electron traps such as Tl^+ ions were X-rayed at room temperature and was illuminated with F light at 120°K. Negative ion vacancies thus produced from F centers began to move about 220°K and combined with F centers to from F_2^+ centers. The activation energy for tne F_2^+-center formation was estimated to be 0.52±0.03eV. An absorption band at 1.35μ at room temperature was confirmed to arise from F_2^+ centers and to shift to 1.40μ at liquid helium temperature. The frequency of the lattice vibration influencing the ground state of the F_2^+ center was 2.9×10^<12> cps, which was almost the same value with that of the M center. The F_2^+-center formation is discussed by assuming the covalent force acting between an F center and a negative ion vacancy.
- 社団法人日本物理学会の論文
- 1969-12-05
著者
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HIRAI Masamitsu
Department of Applied Physics,Faculty of Engineering,Tohoku University
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Matsuyama Tomochika
Department Of Physics Tohoku University
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