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Temperature dependence of ΔG associated with the nanosecond ET reaction determined from the amplitude of the 1.2-ns kinetic phase in the Soret region as described in ref. 20. The best linear fit indicates a small entropic contribution to ΔG (0.20 ± 0.10 meV/K). We note that there is a small systematic error in ΔG due to uncertainties in the spectral deconvolution (20) (≈10 meV), but this error does not significantly influence the temperature dependence.
