The results of an experimental study of the photoconductivity induced by a giant-pulse ruby laser in crystalline anthracene lead to the following conclusions: (1) Up to laser intensities of 5×{}10²⁵ photons cm^-2 sec^-1, charge carriers are generated by a three-photon process. (2) The dominant mechanism for the production of charge carriers involves the photo-ionization of singlet-exciton states. (3) A cross section of 10^-19 cm² at λ=6940 {} was determined for the photo-ionization of singlet-exciton states. (4) A bimolecular rate constant of (5±{}3)×{}10^-7 cm³ sec^-1 for charge-carrier recombination in crystalline anthracene was directly determined.
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Courtens et al. (1967) studied this question.
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