Electron capture in H–H(1s) collisions: two-state approximation with a continuum distorted wave basis

Electron capture from ground state hydrogen atoms by protons is theoretically studied by using a two-state approximation with a continuum distorted wave basis. The total charge transfer cross section for this collision is obtained through the Oppenheimer scaling rule from the analysis of capture in the 1s state. Comparison with experimental values in the energy range 0.1 eV–10 MeV shows that good agreement is obtained for all these energies.