Abstract
The solvent density dependence of the vibrational energy relaxation rates in the S 2 state of azulene has been measured in nitrogen and carbon dioxide at 323.2 and 341 K. The vibrational energy relaxation rate is determined by measuring the time-dependent fluorescence spectra after photo-excitation at 283 nm. The density dependence of the vibrational energy relaxation rate is almost similar to that of the ground state. However, the vibrational energy relaxation rate in the S 2 state is faster than that of the ground state if they are compared at the same solvent density.
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