Cross sections have been determined for electron transfer, direct excitation, and ionization in collisions between protons and H͑1s͒ atoms at proton energies from 1 keV to 16 MeV, extending the pioneering work by Shakeshaft ͓R. Shakeshaft, Phys. Rev. A 14, 1626 ͑1976͒; Phys. Rev. A 18, 1930 ͑1978͔͒ with a much smaller basis and energy range, and following the author's work for other collisional systems ͓T. G. Winter, Phys. Rev. A 76, 062702 ͑2007͔͒. Transfer as well as excitation cross sections into individual states up to 3d ͑excitation up to 4f at the higher energies͒ have been determined with several coupled-Sturmian-pseudostate bases, and tests of basis sensitivity have been carried out. These and ionization cross sections have been compared with experimental, other coupled-state, and numerical results. Ionization and excitation cross sections have also been compared with corresponding Born results at higher energies.

Cross sections for excitation and capture processes into the n = 1, 2, and 3 states (including Balmer-α) and ionization have been calculated at intermediate proton collision energies with atomic hydrogen. In addition, the alignment, A 20 , and polarization fraction, (E), parameters have been calculated. A multi-state close-coupling approach using a triplecentre basis set together with selective perturbative methods are used to make predictions on Balmer-α emission. These results are compared with the available experimental data and various theoretical investigations for fast protons colliding with atomic hydrogen.

No abstract