He− formation by two- and three-electron capture

Spin flip cross-section for the polarized electron and unpolarized hydrogen like ion scattering are reported. In solving the problem the spin-orbit interaction is included in the Hamiltonian for non-zero projectile angular momentum. Contribution ofs-wave is obtained by solving the static exchange equation. Results for the spin flip cross-section have been obtained from nuclear chargeZ=6 toZ=16, and to see the relativistic effect the spin flip cross-section is calculated forZ=80. At low values ofZ thes-wave contributions are most dominant. For largeZ the contribution of spin-orbit is not insignificant.