Non-linear effects on solvation dynamics

We study the non-linear effects on the dynamical process of the solvation in a polar solvent. On the basis of the non-linear generalized Smoluchowski equation with the linear-responce free energy, we calculate the time dependence of the solvent-solute interaction. It is shown that the solvation process becomes slow in the long-time region where the non-linear coupling between the dynamics of the solvent number density and the orientational relaxation is significant.