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The experimental evidence of an anomalous behavior in the decay times ofTl$^+$-like impurity centers in alkali-halide crystals has generated a revivalof interest with respect to these materials. We discuss here about thepossibility that the $A_T$ emission of KCl:Tl can be considered as a doubleemission, namely as a superposition of the $A_T$ and $A_X$ emission bands. Theplausibility of this hypothesis is discussed in the light of the available, oldand recent, experimental features. A quantitative test of this assumption isperformed in the framework of a model which demonstrates to be suitable forinterpreting other similar cases.

The $A_T$ emission of KCl:Tl interpreted as a double $A_T+A_X$ emission