Abstract. Cross sections have been computed for the charge transfer processes H⁺+Na(3s) to H(nl)+Na⁺, with n=1, n=2 and n=3, and for H(1s)+Na⁺ to H⁺+Na(3l), with l=0, l=1 and l=2. the laboratory energy range studied was 0.5<or=E<or=20 keV amu^-1. A two-centre expansion in travelling atomic orbitals was employed. Comparison is made, where possible, with other calculations and with experiment. For H⁺-Na collisions, good agreement is found over the entire energy range with recent atomic orbital calculations by Fritsch (1984) and with the earlier measurements of Anderson et al. (1979). Agreement with molecular orbital calculations reported by Allan (1986) in an accompanying paper is also good for energies E<5 keV amu^-1. The computed values of the Na 3s to 3p excitation cross section are given.

Print publication: Issue 3 (14 February 1986)