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Based on the experimental data of differential cross sections of e-He elastic collisions at 2 eV, the e-He interaction potential has been drived theoretically by the inversion scattering method. Using the obtained potential, the differential cross sections of e-He elastic collissions at 2,5eV were calculated theoretically. The results show that: 1)The e-He interaction potential at extremely low-enery is real and local one and has the characters of strong Van der Waals potential. 2) The WKB inversion is fail for the present case, but the quantum inversion is still successful. 3) The quantum inversion potential can produecd good reaults in agreement with experimental data.

Calculations are conducted for the differential cross sections of elastic scattering of atomic hydrogen by positron in the energy range of 50-300 eV based on a multiple-scattering expansion method. Discussion of the present results is given and comparison is made with other current theoretical calculations.

The multiple-scattering expansion for (e, 2e) collisions in H-atoms is extended to the case of complex atoms.

The multiple-scattering expansion method proposed in Ref [6] has been applied to the calculations for the triple differential cross sections of the (e,2e) collisions of atomic hydrogen under the Ehrhardt geometric conditions. The present results are in good agreement with the experimental data.