Theoretical study of associative ionisation in H⁺-H⁻collisions at low energy (0.001-5 eV)

A simple mechanism responsible for H + -H - associative ionisation is proposed which selects the (2p sigma u ) 2 1 Sigma g + configuration state as the autoionising state relevant to this process. According to results on mutual neutralisation, the HH 1 Sigma g + and B"B 1 Sigma u + adiabatic states of H 2 are assumed to be the way of entering the transition region. Quantal calculations have been performed including all dissociation and ionisation channels. The calculated cross section is found to be in agreement with the previous experimental results of Poulaert et al. (1978).