The effect of solvent viscosity on the population relaxation times of the S1 state of azulene and related compounds
Tittelbachhelmrich, D.Wagner, Brian D.Steer, R. P.
Chemical Physics Letters
The S1 population decay times of azulene and 4,6,8-trimethylazulene have been measured in solvents with a wide range of viscosities using a two-photon, two-color, pump-probe method. The S, lifetimes vary as expected on the basis of the energy gap law. No effect of solvent viscosity is observed, contrary to a previous suggestion. Data for 2-chloroazulene in non-viscous solvents are also reported.