Fluorescence excitation spectra of all-trans-1,6-diphenylhexatriene conformers: Adiabatic conformer equilibration in the 21Ag state

- The fluorescence excitation spectra of all-trans-1,6-diphenyl-1,3,5-hexatriene conformers were resolved.
- The resolved spectra are very similar and differ significantly from previously resolved conformer absorption spectra.
- They reveal that adiabatic conformer equilibration, although not complete, occurs to a significant extent in S1.