SEARCH Articles Figures Tables Mpller-Plesset perturbation theory second-order properties Nonlinear second-order properties Order properties Physical properties second order Properties of Second-Order NLO Polymers Second order electrical properties Second-order NLO properties Second-order non-linear optical properties Second-order nonlinear optical propertie Second-order nonlinear optical properties Second-order properties, calculation Second-order property instances Second-order response properties