A methyl torsional potential with V6=–17 ± 4 cm–1 in S1 has been obtained for 4-methylstyrene from supersonic jet fluorescence excitation spectra. For S0, dispersed fluorescence spectra give V6=–17 ± 1 cm–1 for methyl and V2= 943 ± 58 cm–1 and V4=–208 ± 31 cm–1 for vinyl torsion.
J. M. Hollas and P. F. Taday, J. Chem. Soc., Faraday Trans., 1990, 86, 217 DOI: 10.1039/FT9908600217
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