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(a) Femtosecond time-resolved spectra of the ground and S1 and S2 excited electronic states of DPO. The evolution of the spectra over time in the individual traces (b) and in the contour plot of (c), reveal the growth of the large Raman features attributed to S2, their disappearance with a ∼100 fs time constant, and the lack of any spectral shift over this time period.
