My understanding of the lippert equation is that it predicts the solvent mediated stokes shifts in the fluorescent and absorption spectra for a molecules.
? a ?? f = 2/hC[(e-1/2e+1)-(n^2-1)/(2n^2-1)]*(u1-u2)^2/a^3
where e is the dielectric constant, u is the dipole moment of the S1 and S0 states, and n is the the refractive index of the solvent.
I understand where e and u come into play, but why does the refractive index affect this stokes shift, and why is it subtracted in this equation?