Three - Body Approach to Proton - Hydrogen Charge - Exchangeand Elastic

The impact parameter Faddeev approach to atomic three-body collisions which has been developed for, and successfully applied to, ion-atom scattering processes, has now been developed further by including, instead of the Coulomb potentials, the full two-particle oo-shell Coulomb T-matrices in alìtriangle' contributions to the eeective potentials. Results of calculations of proton-hydrogen collisions with only the ground states of the hydrogen retained in both the direct and the rearrangement channels are presented. Total and diierential electron-transfer as well as diierential elastic scattering cross sections are obtained simultaneously in very good agreement with experiment, over a wide range of (nonrelativistic) incident energies.