SEARCH Articles Figures Tables Approximation polarization propagator Contact approximation polar solvents Electrochemical polarization approximation First-order polarization propagator approximation Multiconfigurational polarization propagator approximation Polarization approximation (two molecules) Polarization approximation is illegal Polarization approximation, symmetrize Polarized-orbital approximation Second order polarization propagator approximation Second-Order Polarization Propagator Approximation model Second-order Polarization Propagator Approximation Calculations The perturbation is always large in polarization approximation Third-order polarization propagator approximation Zeroth-order polarization propagator approximation