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Distance dependences of the rates of single-step and two-step electron tunneling reactions. Solid line indicates theoretical distance dependence for a single-step, ergoneutral (ΔG°RP = 0) tunneling process (β = 1.1 Å−1). Dashed lines indicate distance dependence calculated for two-step ergoneutral tunneling (R←H←P) with the indicated standard free-energy changes for the R←H step.
