Abstract
Using ∼ 100 femtosecond laser pulses we have studied the spectra evolution in time associated with the bonnd-twisting event in the barrierless isomerization of a cyanine dye molecule in solution. The experimental result are compared with Monte Carlo simulations based on a modified Smoluchowski equation. The results shwo that the actual bond-twisting event is observed as a delayed onset of ground state recovery and as very fast spectral shifts of stimulated emission and excited state absorption.
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