Cooling Fluorescence, Raman spectroscopy

Conformational changes in molecules often proceed along vibrational pathways. In selected cases these pathways can be represented by one- or two-dimensional vibrational potential energy sur ces (PESs). In oiu laboratory we have for many years investigated the PESs of cyclic andbicyclic molecules in their electronic ground states using far-in rared and Raman spectroscopy.In recent years we have also used fluorescence spectra of jet-cooled molecules and ultraviolet absorption spectra to determine the PESs in electronic excited states. In the present paper we present our results for the ground (So) and excited [Si(7t,7t ")] electronic states of several molecules in the indan family which are shown in Scheme I. 

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