We report the excitation spectrum for intrinsic photoconductivity measured with unpolarized light incident on the 001 face of an anthracene single crystal. Over the photon energy range 3.75 to 4.4 eV, the room temperature (near 295 K) quantum yield of free carriers rises by a factor of 103. The activation energy for free carrier production rises steeply between 3.87 and 4.06 eV and then levels off. These results are compared with recent work by Lyons and Milne and some discrepancies are noted.
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Kato et al. (1980) studied this question.