Color Center Studies in Alkali Halides by Pulsed Electron Beam Irradiation
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概要
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The formation and decay of color centers in alkali halides have been studied using a pulsed electron beam. The F and V-type bands reach maximum heights in optical density at the end of the radiation pulse. V_k and V_1 bands in KBr appear to show the first order decay kinetics; their room temperature life times are 1.3 and 3.8μsec, respectively. A fraction of F and F' bands bleach by the annihilation with migrating V_k centers. The activation energies for the disappearance of H, V_1 and V_k centers in KBr are found to be 0.09, 0.25 and 0.39±0.02eV, respectively. A fraction of H centers in KCl decays with a temperature independent time constant (〜0.13μsec) which is due to the tunneling with nearby F centers. In crystals containing U-centers (H^- ions) the F band continues to grow for several microseconds after the pulse. Absorption bands which decay with the same time constant as the F band growth have been found at 775mμ (KBr) and 725mμ (KCl).
- 社団法人日本物理学会の論文
- 1967-12-05