A transient absorption is observed in anthracene (A)-N, N-diethylaniline ( D) solutions in toluene excited by the 3371 angstrom line of a nitrogen laser. The lifetime of the transient matches that of the fluorescence of the excited (D center dot A) charge transfer complex. The absorption is assigned to a transition from the fluorescent CT state to a higher CT singlet of the complex. Excited singlet-singlet absorptions are also observed fox the free anthracene and N, N-diethylaniline molecules.
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Photoelectric Spectrometry Group England Staff, 1967, UV ATLAS ORGANIC COM