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Single-centred expansion coupled states calculations are performed with basis sets large enough to achieve convergence. The particular collision system studied is p+H(1s) at energies of 15 keV and above. The results obtained establish the validity of this method for calculating excitation and electron removal cross sections even in situations where charge transfer is large. Cross sections for 1s to 2l', 3l' and 4l' excitation and for electron removal are presented and compared to experiment and to other theoretical calculations.

Single-centred coupled states calculations of cross sections for excitation and ionization of atomic hydrogen by antiprotons are compared to previous calculations and to experiment for projectile energies in the range 1-300 keV. A noticeable disagreement between experiment and theory is found for the antiproton ionization results in the range 30-80 keV.

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