Abstract
The S0↔S1 electronic transition of 1H-indazole has been investigated by laser-induced fluorescence (LIF) excitation and dispersed fluorescence (DF) spectroscopies in a supersonic free jet expansion. Ground and excited state vibrational modes were assigned based on the observed band frequencies and intensities, ab-initio frequency calculations, and available infrared absorption data. Unexpected “symmetry forbidden” transitions were observed in the DF, which, according to our assignments, would originate from the 271 excited state in-plane fundamental to several ground state out-of-plane fundamentals. Accepting the assignments, this observation would indicate a vibronic coupling between the S1 (or S0) state (A′) and an excited nπ*-type electronic state of A″ symmetry.
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