Figure shows the energy profile (ΔG°, kJ mol -1 ) of the steps (i-iii). Along the IRC in step ii), a PCET involving one PT and one ET occurs among the PRC (HO2 • -RsvH3), which forms the PC (H2O2-RsvH2 • ) via the TS with a low activation energy (Ea = 27.3 kJ mol -1 ). Next, Figure shows the dependence of O-H bond distance (4'O-H, black line, nm) on the number of electrons in the π-orbital of the planar molecule of RsvH3 along the IRC (blue circles). The spin density distributions were localized on the radicals before and after the TS along the PCET, showing that the radical localized on HO2 • in the initial PRC was transferred to RsvH2 • in the resulting PC.