Calculation of Anisotropic Excitation Cross Sections and the Polarization of Impact Radiation of He Atoms Induced by Electron and Proton Impacts

The excitation cross sections of helium atoms for the transitions 1s→2pm, 1s→3pm, 1s→3dm, and 1s→4dm induced by the proton impact (5–40 keV) and electron impact (50–200 eV) have been calculated. These excitation cross sections have been used in calculating the polarization of impact radiation for the radiative transitions D1→P1 and P1→S1. The theoretical values of excitation cross sections and polarization of impact radiation are compared with the experimental results.