Coupled-State Calculations ofH+-H Scattering

A numerical calculation has been performed for proton-hydrogen-atom scattering using $1s$, $2s$, $2p_0$, and $2p_1$ hydrogenic states in a two-center traveling-wave expansion in the impact-parameter method. Discrepancies with past work are pointed out and discussed. Cross sections for direct and exchange scattering into $1s$, $2s$, and $2p$ states, as well as the polarization, are presented for ion energies from 500 eV to 400 keV. Results are compared with other calculations using different expansion functions, both hydrogenic and "pseudostate."