Fig. 4. (A) Transient UV-visible absorption spectra obtained at 50 fs time delay (red curve) and 1 ps time delay (blue curve) for [Fe(CN)4(bpy)]2– in dimethyl sulfoxide. (B) The two decay associated spectra returned by global analysis of the data (red and blue curves) with lifetimes of 2.4 ± 0.4 ps and 19.0 ± 1.1 ps, are shown with the inverted ground state UV visible absorption spectrum (gray curve). (C) Kinetics of the UV visible pump-probe data at 370 nm and 440 nm (red and blue curves) with single- and bi-exponential fits (green dashed and black curves respectively) retuning 14 ps lifetime for the single exponential decay and 2.5 ± 0.5 ps and 18.5 ± 0.9 ps lifetimes for the double exponential decay.
