Measurements of ion and molecular ion beam induced luminescence in NaCl at 77 K show that the major emission features near 2.4 and 3.4 eV are sensitive to the total damage produced in the lattice. The comparison of H+ and H+ 2 or N+ and N+ 2 results allows one to record the effects of variations in radiation flux in the region of the ion tracks. The method avoids the secondary problems produced by more conventional methods for changing the average rate of energy deposition. From these results the earlier suggestion that the 2.4 eV emission might result from a bi-exciton state is definitely rejected.
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Chandler et al. (1979) studied this question.
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