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(CexCa1-x)F2+x single crystal with x = 0.0001 - 0.03 were grown by the mu-PD method. Ce3+ doping in CaF2 lattice gives rise to characteristic absorption and emission bands, which are governed by the characteristics of the isolated Ce3+-Fi- C4v pair centers and small clusters composed from these pairs. With increasing Ce concentration there is a strong increase of the absorption bands related to the...
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