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The dynamic parameters of atoms or molecules were generally determined by the electron scattering method,such as the low-energy or high-energy electron scattering methods.However, the electron scattering methods has its intrinsic merits and demerits.One of its merits is the large scattering cross sections,and one of its demerits is the strong interaction between the incident electron and target which results in the invalidity of the first Born approximate (FBA).