Changes in Optical Absorptions in Natural Quartz Irradiated by $\gamma$-Rays and Its Isochronal Annealing
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概要
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The clear natural Brazilian quartz used in this experiment had a weak optical absorption at the A1-band (1.85–2.0 eV) before $\gamma$-ray irradiation. By irradiating the sample, a strong A2-band absorption (2.65–2.75 eV) was produced, while the A1-band absorption increased only very slightly, although both the A1- and A2-bands are related to an aluminum impurity. The thermal activation process of the A2-band absorption was investigated by isochronal annealing to evaluate the activation energy. When possible losses were taken into consideration, an activation energy $E=0.32$ eV was obtained, where the losses are light transmission losses originating from multiple scattering, absorption by surface damage, and scattering in random directions by the surface roughness of a specularly polished quartz plate. When an ideal state was assumed, in which the transmission losses did not exist, an activation energy $E=0.28$ eV was obtained. From these results, the activation energy for this color center is evaluated to be $0.3\pm 0.2$ eV.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-05-15
著者
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Aoki Takashi
Department Of Engineering Physics Chubu University
-
Aoki Takashi
Department Of Aquatic Bioscience Tokyo University Of Fisheries
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