The main discussion, however, is centered around the excited state dynamics of prbimRuPt. For a more thorough examination of the relevant information regarding prbimRu, please refer to Section 7.2 of the SI. The initial TA spectrum (∆t = 0.3 ps) of prbimRuPt shows pronounced ground state bleach (GSB) contributions between 430 to 530 nm, resembling the shape of the ground state absorption band (cf. overlay of TA spectra with the scaled and inverted steady-state absorption spectrum in Figure ). Those GSB contributions are accompanied by two major excited state absorption (ESA) features: A relatively strong ESA band peaking at 605 nm and broad and flat ESA ranging from 545 to 780 nm.