Figure 5.

a) Example data set from fs transient absorption measurements following excitation of R6G^. in DMSO. Red indicates absorption and blue corresponds to bleaching or emission. b) DADS from the global lifetime analysis of the fs transient absorption measurements. The DADS of the fastest decay (black, scaled by 0.1) corresponds to the decay of the excited radical to the hot ground state radical and hot R6G⁺. The second DADS (red) is assigned to cooling of the two hot species. The derivatives of the corresponding ground state spectra are shown as dotted lines for comparison. The third DADS (yellow) fits the stimulated emission of the R6G⁺ ground state. The very long‐lived (green) component corresponds to the products at the end of the time window, that is, cold R6G⁺ and the loss of radical R6G^..