Ionisation and electron transfer in He2++H(1s) collisions

Ionisation in collisions of alpha particles with hydrogen atoms has been investigated for impact energies lying between 2 and 900 keV amu -1 . The multistate semiclassical impact parameter model with a two-centre expansion in travelling atomic orbitals was employed. The computed ionisation cross sections are, in particular in the low-energy region, in good agreement with the recent experimental data of Shah et al (1988). The total and partial charge transfer cross sections have also been calculated and found to be in harmony with the available theoretical and experimental data.