Fig. 3: Kinetic model, temporal concentration profiles of reacting species of BiI3.
From: Filming ultrafast roaming-mediated isomerization of bismuth triiodide in solution
a Kinetic model for the photochemistry of BiI3 revealed in this work. Upon 400 nm excitation, BiI3 undergoes isomerization to the early isomer and dissociation to radical fragments, BiI2• and I•. The early isomer subsequently relaxes to the late isomer and ground-state BiI3, while a portion of the radical fragments to the ground-state BiI3 through geminate recombination (gem. recomb.). The remaining radical fragments stay almost unreacted within the probed time range due to the slow rate of non-geminate recombination (non-gem. recomb.). b The concentration profile of reacting species corresponding to the kinetic model shown in (a). The inset shows the early-time concentration profile up to 2 ps in a linear time scale. The solid lines were obtained from the global fit analysis of ΔSiso’(q, t) based on the kinetic model shown in a and the dots with one-standard-deviation error bars were obtained by independently fitting the individual experimental data with a linear combination of solute, cage, and solvent terms.
