Non-Coulombic components

As noted above, the curl of the expression on the right-hand side of Equation 7.47 vanishes. However, it does not mean that the Coulombic and non-Coulombic components—the former is the electric field produced by the Fermi-Coulomb hole and the latter arises from the kinetic energy tensor—of this field also have vanishing curl. Thus the potential Wxc of Equation 7.38 may sometimes be path dependent [21]. 

In order to illustrate the relationship of polarity measurements and photochemical charge separation, let us estimate the non-Coulomb component of the change of the standard Gibbs energy AG for the transfer of a singly-charged ion with a radius r = 5 A from the micellar phase into the aqueous phase [9] ... 

The non-Coulombic component of the energy can be associated with two effects. Firstly, the introduction of an ion into the compact double layer is disadvantageous, since the effective dielectric constant in this region is low this effect may be of the order of several kilocalories (see section 6.1). Secondly, for a sufficiently effective tunneling of the proton, it must approach the electrode to a distance less than the equilibrium distance for this we must perform work against the repulsive forces, and this work can be also estimated at several kilocalories (section 7.1). It is difficult to give an exact estimate for its lower limit can be esti-... 

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