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An Explanation of Optical Transmission of Some Rare Earth Doped BaF_2 Crystals After γ Irradiation

Gu Mu; Chen Lingyan; Du Jie; Xiang Kaihua(Department of Physics, Tongji University Shanghai 200092 China)Chen Gang;Ren Shaoxia; Zhang Fengning(Beijing Glass Research Institute Beijing 100062 China)  
In this paper, we used the Discrete Variational Xα (DV-Xα) method to calculate the energy level of some rare earth doped BaF2 crystals and indicated that the Eu, Dy and Yb elements will change their valence from +3 to +2 under irradiation and thus change the optical properties of the crystals. The results show that this radiation effect model presented agrees with experiments.
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