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Gamma-ray irradiation-induced color centers in Al 2 O 3 crystals grown by temperature gradient techniques (TGT) under a strongly reducing atmosphere were studied. The transition F + →F takes place during the irradiation process. Glow discharge mass spectroscopy (GDMS) and annealing treatments show that Fe 3+ impurity ions are present in the crystals. A composite (F...
Gamma-ray irradiation induced color centers and charge state recharge of impurity and doped ion in 10at.% Yb:YAP have been studied. The change in the additional absorption (AA) spectra is mainly related to the charge exchange of the impurity Fe 2+ , Fe 3+ and Yb 3+ ions. Two impurity color center bands at 255 and 313nm were attributed to Fe 3+ and Fe 2+ ions,...
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