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Abstract
The photoconductivity of phenazine crystals has been measured as a function of temperature and wavelength of excitation. In the singlet absorption region it appears that only free electrons are generated, and the overall generation process has an activation energy which is independent of the singlet absorption process. Photoconduction in the triplet absorption region is primarily due to hole detrapping; the photoconduction spectra show the structure of singlet-triplet absorption.