Abstract
Resonance Raman spectra of styrene vapor excited in the S 2 /S 3 and S 4 absorption systems are reported. The lack of double bond torsional scattering activity is taken as evidence of high barriers to rotation in all the excited states examined. Consequences for styrene photoisomerization are discussed. Excitation to S 2/S 3 is delocalized in nature, while S 4 excitation is benzene-like. The observed scattering intensities are largely in agreement with the jet absorption analysis and the results of Franck-Condon calculations.
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