Marcus theory reorganisation energy

According to the semiclassical Marcus theory [6], the rate of electron transfer depends on the reduction potential (AGq), the electronic coupling matrix element Hda), and the reorganisation energy (A) ... 

Figure 4.8 Classical Marcus theory section across the reaction coordinate X through the free energy hypersurface of the reaction complex R and product complex P for an ET reaction, showing the activation barrier AG, the reorganisation energy A and the free energy of reaction AG°.

The classical theory of electron transfer developed by Marcus starts with the same kind of hard spheres in a dielectric continuum model that is used to derive the free energy of solvation of an ion. A central role in the theory is played by the reorganisation energy X, which in its simplest definition is given by... 

In general terms, the theory of Marcus involves a model for ET reactions based on the approximation that the inner-coordination sphere energy is independent of the outer-sphere reorganisation. In its classical formulation, TM provides the rate for a self-exchange reaction such as reaction (16.1)... 

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