Abstract
Radiative and non-radiative processes of S - -vacancy pair centers and their relation to the F-center formation in NaCl crystals have been investigated between liquid helium temperature and room temperature. Two emission bands (4.10 and 2.09 eV) and their three excitation bands (5.65, 4.9 and 4.15 eV), which are ascribable to the centers, are observed. The intensities of the 4.10 and 2.09 eV emission bands decrease at high temperatures owing to the increased probabilities of non-radiative processes with activation energies of 0.22 eV for 4.10 eV emission and 0.06 eV for 2.09 eV emission. These non-radiative processes are discussed in connection with the formation of F centers.
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