A spectrophotometer has been built using commercial units which can measure photo-induced changes in absorption of 5 parts in 10 6 and lifetimes of photo-induced transitions greater than 10 −6 S. Results are presented of the triplet-triplet absorption spectra and lifetimes of some polycyclic aromatic hydrocarbons and of a shortlived species occurring during photoexcitation of lumiflavine.
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Slifkin et al. (1970) studied this question.
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