EVIDENCE FOR $S_{1}/S_{2}$ ELECTRONIC STATE MIXING IN THE $S_{1}-S_{0}$ FLUORESCENCE EXCITATION SPECTRUM OF 1-NAPHTHOL $^{*}$

$^{a}$ Work supported by NSF (CHE9224398)Author Institution: Department of Chemistry, University of PittsburgThe role of $S_{1}/S_{2}$ state mixing in the $S_{1}-S_{0}$ spectrum of napthalene is well known. The $8^{1}_{0}$ vibronic band, coupled to the $S_{2}$ state, is polarized along the short molecular axis, unlike the $)^{8}_{0}$ band which is polarized along the long axis. We have observed similar behaviour in the $S_{1}-S_{0}$ electronic spectrum of l -naphthol. Analysis of the rotationally resolved spectrum of the vibronic band at $\Delta E=414$ $cm^{-1}$ of trans-l-napthol reveals that the transition that the dipole is tilted towards the short axis. Additionally, the spectrum is purturbed. These effects are attributed to coupling of this vibrational level in the $S_{1}$ state to the $S_{2}$ state which may influence the portion transfer behaviour of l-naphhol