Redox potential/equilibrium constant, atom

Correlating Redox Potential with Equilibrium Constant for Atom Transfer. 242... 

The hydrated electron, if the major reducing species in water. A number of its properties are important either in understanding or measuring its kinetic behavior in radiolysis. Such properties are the molar extinction coefficient, the charge, the equilibrium constant for interconversion with H atoms, the hydration energy, the redox potential, the reaction radius, and the diffusion constant. Measured or estimated values for these quantities can be found in the literature. The rate constants for the reaction of Bag with other products of water radiolysis are in many cases diffusion controlled. These rate constants for reactions between the transient species in aqueous radiolysis are essential for testing the "diffusion from spurs" model of aqueous radiation chemistry. 

As an alternative to Eq. (8), the low pressure limit of po may be found by exploiting the fixed redox relationship between metal, oxygen and oxide. At very low oxygen pressures all surface oxygen desorbs to leave metal crystallites on the oxide surface [17,79,38]. This fixes the maximum of the metal chemical potential at that of a bulk metal atom, e.g. for rutile p(Ti) = buik(Ti). Since the surface is still in contact with a reservoir of bulk rutile, the overall oxide potential is constant p(Ti02)= buik(Ti02), and so at equilibrium the oxygen chemical potential must be at its minimum ... 

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