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We have used picosecond white-light spectroscopy to study evolution of absorption in NaCl after pulsed band-gap excitation. Spectra at 80 and 300 K, initially very similar, subsequently develop features of well separated F-H pairs (300 K) or of self-trapped excitons (80 K). We interpret the spectra in terms of diffusion of the H center in the neighborhood of the complementary F center, corresponding to reversible interconversion on the lowest potential surface connecting the exciton and the F-H pair.
Williams et al. (1984) studied this question.