Abstract
Abstract The fluorescence excitation spectrum for the first singlet-singlet electronic transition of hexafluorobiacetyl (CF 3 COCF 3 CO) at very low temperature in supersonic free jet expansion is presented and discussed. The molecule appears to remain planar in the excited state. A Franck-Condon model is used to represent quantitatively the low-frequency features (relatively to the O-ω transition at 21980 cm −1 ) and the potential barriers for the internal torsional modes are shown to decrease in the excited state.
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