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Scheme of the time-resolved fluorescence spectrometer based on noncollinear parametric amplification. BS:4:1 beam splitter; S1, S2: mechanical shutters; HW1-HW3: half-wave plates; SH1, SH2: -thick frequency-doubling BBO crystals; DM1, DM2: dichroic mirrors; L1, L2: fused silica lenses; SM1, SM2: spherical mirrors; PA: -thick parametric amplification BBO crystal; and Sp: spectrograph.
Comparison of the steady-state fluorescence spectrum and integrated transient fluorescence spectrum of Coumarin 6 in aniline. The latter was obtained by integrating transient spectra over the range of available delay times . The correction curve used to correct transient spectra is the ratio of the two spectra.
Time-resolved fluorescence spectra of Coumarin 6 in aniline for short (a) and long (b) delays between excitation and gate pulses. The raise of the signal for short delays is accompanied by a shift of the maximum towards longer wavelengths, presumably caused by a vibrational cooling, whereas the quenching of the fluorescence for longer delays is a result of electron transfer from the solvent to the dye molecules. The kinetic trace of the signal at the maximum of the spectrum together with a monoexponential fit of the decay is shown (c).
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