In thinking about CT states that might be relevant in organic photovoltaic applications, it is interesting to note that even nonpolar solvents (with ε 0 5) afford a large nonequilibrium correction to a CT excitation energy. This can be seen for , for example. The nonequilibrium correction comes from the optical dielectric constant, which is related to the electronic polarizability of the solvent molecules and has values ε ∞ = 1.7-2.3 for most common solvents, even while the static dielectric constant varies from ε 0 = 2-4 for nonpolar hydrocarbons up to ε 0 = 78 for water.