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Abstract
Fluorescence studies of Cu + and Ag + impurity centers embedded in LiCl and NaCl are reported. The emission process is shown to occur in the same way in these systems where the emitting levels are two very close excited states in thermal equilibrium. The lowest one is metastable and is considered to take a prominent part in the lengthening of the luminescence decay time. Multiple-scattering Xα method is used to describe the electronic structure of Cu + in sodium chloride. The present calculation produces good quantitative agreement with experiment concerning mainly the optical excitations and the emission mechanism of the luminescent centers.
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