Solvent reorganization energy, Born

The reorganization of the solvent can be expressed through its polarization, which also contains two contributions one from the electronic polarizability of the solvent molecules, and the other from the librational and vibrational motion. Only the latter are slower than the electron exchange as such, and contribute to the solvent reorganization energy Aout- This takes a form that is reminiscent of the Born formula for the energy of solvation ... 

To obtain an estimate for the energy of reorganization of the outer sphere, we start from the Born model, in which the solvation of an ion is viewed as resulting from the Coulomb interaction of the ionic charge with the polarization of the solvent. This polarization contains two contributions one is from the electronic polarizability of the solvent molecules the other is caused by the orientation and distortion of the... 

The energy required to reorganize the solvent, Ao, is obtained by a different procedure. The medium outside the reactant (or reactants) is treated as a dielectric continuum with the polarization made up of two parts, a relatively rapid electronic polarization and a slower vibrational-orientational one. The latter has to adjust to a nonequilibrium value appropriate to the final state, contrary to the former. On the basis of the Born solvation theory Aq (if one electron is transferred) is given by ... 

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