The optical and paramagnetic absorption spectra of MgOiMn crystals of different origin, irradiated in a reactor, have been investigated. It is found that, in spite of only a small amount of Mn-"'" impurity ions in the investigated crystals, their infiuence on the efficiency of formation and accumulation of F+-centers i.s dominant. The dependence of the number of F"* -centers both on irradiation dose and on manganese concentration is studied.
According to electron paramagnetic resonance spectra of MgO:Mn crystals irradiated in a reactor, the dependences of the concentration of F + centers on the irradiation dose and on the content of impurities have br obtained. The strong influence of paramagnetic Mn 2+ ions on the efficiency of the accumulation of F § centers is determined.
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