Abstract
The excitation spectra with the vibronic structure near the 360 nm absorption band and emission spectra with the vibronic structure near the 430 nm emission band have been studied comparing neutron irradiated α-Al2O3 at pile temperature (360 K) and at 20 K. In particular, the optical vibronic emission spectra of the neutron irradiated single crystal α-Al2O3 in low temperature have been analyzed. Huang Rhys factors of 360 nm excitation and 430 nm emission band are calculated. Also, Debye temperature has been estimated by curve fitting using temperature dependence of the excitation band. It can be seen that the excitation band derives from F2+ type center and emission band is suggested as F+ type center.
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