Abstract
In the temperature region from 0.35 to 4.2 K the decay kinetics of the triplet AT and Ax emission of NaCl:Ga crystals as well as the spectral and polarization charcteristics of the single decay components of the emission are investigated. An off-centre displacement of the Ga+ ion in the tetragonal (T) minima of the relaxed excited state (RES) is found. No manifestations of the off-centre displacement of the Ga+ ion in the trigonal (X) minima are observed. It is shown that fast tunnelling transitions between various equivalent off-centre positions of an excited Ga+ ion in the plane normal to the tetragonal Jahn-Teller distortion axis lead to the tunnel splitting of the metastable as well as of the radiative T minima of the triplet RES of the Ga+ centre. It is evident from the existence of two slow and two fast components in the low-temperature decay kinetics of the AT emission. In case of NaCl:Ga the energy (δ) of tunnel splitting of the radiative minimum is assumed to be larger than the energy (2E) of the spin–orbit splitting of this minimum which is caused by the lowering of the RES symmetry due to the off-centre displacements of the Ga+ ion. As a result, off-centre effects are not observable in the ODMR spectra of Ga+ centres in NaCl:Ga crystals, unlike Ga+ centres in other alkali halides, where the energy δ is probably smaller than 2E. [Russian text ignoured]
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