Fig. 2.

Summary of optical transient absorption kinetics acquired from Ca-MnO₂ in an aqueous suspension containing Nafion. (A) Transient kinetic traces show a slight delay in the onset of the ESA at 550 nm relative to the bleach at 345 nm. (B) Decay kinetics of the ESA and bleach up to 8 ns. The time-zero was shifted by 0.2 ps to enable plotting on a logarithmic scale. Equivalent data for Na-MnO₂ are given in Fig. S3 A and B. (C) Comparison between the decay kinetics of the bleach recorded at 580 nm for Ca-MnO₂ and Na-MnO₂ in Nafion, fitted with two-component exponential decay functions.