Fluorescence from the second singlet electronic excited state (S2) is called `anomalous', since it violates Kasha's rule. The dynamics of high-lying singlet excited states has been the subject of ultrafast spectroscopy. The S2 fluorescence in malachite green (MG) and its viscosity dependence have been investigated using femtosecond fluorescence spectroscopy. The decay of S2 fluorescence consists of two components. The faster one shows a similar viscosity dependence as that of S1 but the change is smaller. The slow component becomes dominant with the increase of the viscosity, but its time constant is almost independent of the viscosity.
|Number of pages
|Published - 1997
|Proceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim - Chiba, Jpn
Duration: 1997 Jul 14 → 1997 Jul 18
|Proceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim
|97/7/14 → 97/7/18