Abstract
Steady-state and time-resolved spectroscopy of a triphenylmethane dye (ethyl violet) exhibiting a fast electronic relaxation is studied. Transient transmissions were probed with a supercontinuum in the 1-20 ps range and fluorescence decays were monitored with a streak camera. Delayed bleaching is observed in solution at room temperature when probing in the short wavelength edge of the main ground state absorption band (530–560 nm). The various shapes of the transmission curves measured at wavelengths where transient absorption, ground state bleaching or amplification dominates are explained by a model involving one absorbing intermediate state. The existence of two electronic transitions in the visible ground state absorption is confirmed as well as non-exponential fluorescence decay. The relaxation mechanism is discussed in terms of internal twisting with charge redistribution.
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