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Two-photon-induced fluorescence intensity decays of: (a) rose bengal in the presence of 5 M KI, (b) pyridine 1 in water, and (c) LDS 798 in water. The instrument response function was obtained from a Ludox scatterer (red). The recovered lifetimes are: 16 ps for rose bengal, 37 ps for pyridine 1, and 27 ps for LDS 798. The excitation (810 nm) was from a femtosecond Ti : sapphire laser.
