✍ Scribed by Minyung Lee; Robin M. Hochstrasser
No coin nor oath required. For personal study only.
The fluorescence lifetime of bifluorene was found to be 240 times shorter than that of fluorene and it is viscosity dependent in alkane and alcohol solvents. The lifetime is also temperature dependent with Arrhenius energies in the range 3.5 to 4.2 kcal/mol, suggesting that a barrier crossing process is occurring in the excited state. The viscosity data do not fit a Kramcrs equation with hydrodynamic variables. The barrier crossing rates in alkanes increase slightly with increasing viscosity at the lower viscosities.
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Fluorescence excitation and resonant two-photon ionization spectra were measured for 9-ethylfluorene (EFR) molecule cooled in pulsed supersonic expansion of He in the range of 286.5 $ 300 nm. The structures and energies of the global and local minima and the transition states separating them are eva
## Abstract __The dynamics of the excited states of 1‐aminofluoren‐9‐one (1AF) and 1‐(__N__,__N__‐dimethylamino)‐fluoren‐9‐one (1DMAF) are investigated by using steady‐state absorption and fluorescence as well as subpicosecond time‐resolved absorption spectroscopic techniques. Following photoexcita