2.1-eV F-center luminescence has been excited in thermochemically reduced CaO at 78 K using low-intensity photons with energy $E<2.4$ eV, i.e., less than the energy of the main F-center absorption. Thermoluminescence measurements indicate that electrons trapped at substitutional H^2- ions are involved in the energy transfer leading to the luminescence.
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Summers et al. (1984) studied this question.
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