Abstract
WHEN oxygen-free solutions of methylene blue or thionine in dilute sulphuric acid are subjected to flash photolysis using orange-red light filtered from a krypton- or xenon-filled flash-tube, reversible bleaching of the dyestuffs occurs. The bleaching is accompanied by increased absorption in the region 360–440 mµ where the dyestuffs themselves absorb very weakly. The transient species responsible for this absorption have the appearance of being triplet levels of the dyestuffs, disappearing with life-times of less than 30 µsec. The same species are also produced when the light of the flash is filtered through Chance OX7 glass (transmission approximately 250–390 mµ).
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Bridge, N. K., and Porter, G., Proc. Roy. Soc., A, 244, 259, 276 (1958).
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PARKER, C. Wave-length Effect in Flash Photolysis. Nature 182, 130 (1958). https://doi.org/10.1038/182130a0
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DOI: https://doi.org/10.1038/182130a0
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