Abstract
The electronic and vibrational relaxation of photoexcited trans-azobenzene was investigated in solution by picosecond time-resolved Raman spectroscopy. Picosecond time-resolved Raman spectra were measured with the probe wavelength at 410 nm, which is in resonance with a transient absorption appearing after the S2(ππ*) ← S0 photoexcitation. Several transient Raman bands assignable to the S1 state were observed immediately after photoexcitation. The lifetime of the S1 state showed a significant solvent dependence, and it was determined as ∼12.5 ps in ethylene glycol and ∼1 ps in hexane. Time-resolved anti-Stokes Raman measurements were also carried out for hexane solutions to obtain information about vibrational relaxation process. The anti-Stokes spectra showed that the observed S1 state was highly vibrationally excited. In addition, several anti-Stokes Raman bands due to the S0 state were observed after the decay of the S1 state, indicating that the vibrationally excited S0 state was generated after elect...
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