Spectroscopy and dynamics of jet-cooled 4-aminobenzonitrile (4-ABN)

Abstract

Laser-induced fluorescence (LIF) excitation and emission spectra and fluorescence lifetimes of jet-cooled 4-aminobenzonitrile (4-ABN) are reported. The dispersed fluorescence following excitation of transitions in the medium and high excess energy region in the S1 manifold are examined. Strong Fermi resonances between the I02 (000 + 807 cm-1) and 101 (000 + 815 cm-1) bands are observed. The inversion mode dominates in most dispersed fluorescence spectra, confirming the importance of the fluxional amino group in 4-ABN. Broad and unstructured emission in this region is observed for 4-ABN under jet conditions, which may be associated with intramolecular vibrational redistribution (IVR). The rel..