The variational method using a multiconfiguration wavefunction is carried out on the core-excited state 1s2s2p 4P0 for helium negative ion,including mass polarization and relativistic corrections.Binding energy and fine structure are reported.The results are compared with other theoretical and experimental date in the literature.
This paper uses the two-centre atomic orbital close-coupling method to study the ionization and the single electron capture in collision of highly charged Ar 16+ ions with He atoms in the velocity range of 1.2-1.9 a.u..The relative importance of single ionization (SI) to single capture (SC) is explored.The comparison between the calculation and experimental data shows that the SI/SC cross section ratios from this work are in good agreement with experimental data.The total single electron ionization cross sections and the total single electron capture cross sections are also given for this collision.The investigation of the partial electron capture cross section shows a general tendency of capture to larger n and l with increasing velocity from 1.2 to 1.9 a.u..
