Extinction coefficients of the T-T absorptions for solutions of anthracene in benzene and cyclohexane and for 9-bromoanthracene in cyclohexane have been determined by flash photolysis using the ground state depletion method of Hadley and Keller. The respective values of εmax obtained are 53 000 ± 2 000, 85 700 ± 3 200 and 66 500 ± 3 250 dm3 mol–1 cm–1. The T-T absorption spectra in the region of overlap with the ground state absorptions are also evaluated.
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Ledger et al. (1976) studied this question.