Abstract
Absolute resonance Raman scattering excitation profiles are presented for 1,3,5-cycloheptatriene (CHT) excited in resonance with the 1A'-1A photochemically active electronic transition at 260 nm. The resonance Raman cross sections and the absorption spectrum are modeled to quantitate the geometric evolution occuring immediately after excitation. The vibrational scattering intensities are consistent with planarization of the CHT ring, while no evidence for evolution along the methylene CH stretch coordinate is observed
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