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Charge-Transfer-Type Fluorescence of 4-(1H-Pyrrol-1-yl)benzonitrile (PBN) and N-Phenylpyrrole (PP) in Cryogenic Matrixes: Evidence for Direct Excitation of the CT Band

Schweke, D. ; Baumgarten, H. ; Haas, Y. ; Rettig, Wolfgang ; Dick, Bernhard


The fluorescence spectrum of PBN in a neat argon matrix is excitation-wavelength-dependent: at short excitation wavelengths, it consists of dual emission assigned to a charge-transfer (CT) state and a much weaker band assigned to the locally excited (LE) state. The CT emission is broad and almost completely devoid of vibrational structure, whereas the LE band is characterized by vibrationally ...


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