Single crystals of MgO luminesce under x-ray excitation with a multiband spectrum. The 3.6-ev band exhibits a long-time phosphorescence accompanied by an induced photoconductivity. Photostimulation of crystals previously x-ray-irradiated produces a sizable photoconductivity during the excitation. This, together with the phosphorescence, decays with time. Remote hole trapping may account for these observations.
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A. Eisenstein (1954) studied this question.
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