Excited state structural dynamics in higher lying electronic states: S_2 state of malachite green

摘要

The S_2 fluorescence of malachite green is measured with sub 100 fs time resolution. Ultrafast spectral dynamics in the S_2 state preceding S_2 decay are resolved. Measurements in different solvents show that these sub 100 fs dynamics are insensitive to medium polarity and viscosity. They are thus assigned to ultrafast structural evolution between the S_2 Franck-Condon and equilibrium configurations.