Energy Transfer Between AT and AX Minima in KBr: TI, Quantitative Four‐Level‐Model

The decay kinetics of the A‐luminescence in KBr : TI is investigated in the wide temperature region from 4 to 500 K. In the decay of AT emission up to four components with different decay times can be resolved and in AX emission rise time components are found. For the first time the energy transfer between AT and AX emission bands is observed separately between metastable levels (T = 30 to 40 K) and between radiative ones (T = 60 to 120 K). The set of experimental data obtained is sufficient to determine the rate constants for radiative and nonradiative transitions introduced in the semiempirical four‐level model proposed.