An electron trapped at a negative ion vacancy in an ionic crystal, /--centres can be formed by the release of electrons by irradiation with X-rays or by producing stoichiometric excess of anions in the crystal, and give rise to broad optical absorption bands. E-centres consist of F- centres with a further electron trapped in the same vacancy. fA-centres are /--centres modified by one neighbouring cation being different from the cations of the lattice, /--centre aggregates can be formed by arrays of nearest neighbour centres.
What is F-CENTRE?
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