The AT luminescence of KCl: Ga is investigated at 0.38 to 100 I< by spectral, kinetic, and polarization methods. At extremely low temperatures the luminescence decay curve in the magnetio field is decomposed into three components (fast, quick, and slow) with decay times dependent, but light sums independent of the field strength. Polarization degrees of the components are independent both of field and time. The experimental results are discussed in terms of a model suggesting a strong interaction of the optical electron of Ga+ with tetrngonnl vibrations of the crystal lattice.

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The structure of emission and excitation spectra as well as the decay kinetics and polarization of the AT luminescence are investigated for TI+ and In+ centres in XC1:TI and KI:In a t 80 to 0.4 K.The effect of a magnetic field up to 2 T on the decay times, intensities, and polarization properties of the emission occurring from the metastable tetragonal minima of the triplet excited state is studied a t 0.4 to 0.7 K. The parameters of the centres are determined. Good agreement between the experimental results and theory is obtained.

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