Spectroscopy and dynamics of jet-cooled 2-methoxynaphthalene

The S1−S0 electronic transition of jet-cooled 2-methoxynaphthalene has been investigated by the use of laser-induced fluorescence, dispersed fluorescence and time-resolved emission spectroscopy. Two electronic origin transitions were observed, separated by 660 cm−1. They are caused by the presence of a cis (syn) and a trans (anti) conformation of the methoxy group with respect to the naphthalene frame. Intramolecular vibrational energy redistribution was identified by vibrational quantum beats in the case of the cis isomer 978 cm−1 above the S1−S0 origin.