Abstract
The relaxed excited states of the paired Ag - ion center in KCl crystal have been studied by measuring the polarization correlation and the decay time of luminescence. The luminescence of the paired Ag - center consists of a single emission band and shows a noticiable polarization correlation with the excitation band. The degree of polarization is almost constant in the region above 7 K, but changes steeply below 5 K. From analysis of the changes, it is concluded that the emission takes place at the higher temperatures from the nearly degenerate two states in 3 Σ u + whose energy splitting being about 0.19 meV. Below 5 K, the luminescence takes place preferencially from the lower state of the nearly degenerate states. Furthermore, it is found from the temperature dependence of the decay time of luminescence that the remaining lowest state in 3 Σ u + participates in the luminescence process as a trapping state.
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