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Free energy surface for redox reaction (Red → Ox). The free energy surfaces (Marcus parabolas) for the reduced (Red) and oxidized (Ox) states are denoted by VRed and VOx. To calculate the free energy difference, ΔGRed→Ox for the above reaction we need to consider the vertical difference in energy and the reorganization energies (λRed and λOx). 〈EOx − ERed〉Red = 〈VIE〉Red and 〈ERed − EOx〉Ox = 〈VEA〉Ox
