Laser-induced fluorescence excitation spectra of jet-cooled chrysene

Abstract

The laser-induced fluorescence excitation spectrum of the S 1 ← S 0 transition of jet-cooled chrysene is reported for the first time in the range 26500–29800 cm −1, together with experimentally recorded rovibronic band contours of six of the more active transitions in the spectrum. A preliminary analysis of vibronic features of the first excited singlet state is given, based primarily on ground state vibrational assignments together with comparison of the fluorescence spectra of other jet-cooled polycyclic benzenoid hydrocarbons. An intense progression in the out-of-plane butterflying motion is observed. The weak transition at 26595 cm −1 is assigned to the origin band in this molecule, which is shifted about 1000 cm −1 to the red of the S 1 origin reported by others.