Double capture in C6+-He collisions at low impact energies

The authors have calculated the cross sections for the production of (2lnl'), with n=3, 4 and 5, and (3l3l') states by double electron capture in C 6+ -He collisions at low impact energies. Their values for these cross sections are very close to the experimental data. The present cross sections for the series (2lnl') follow a n -3 scaling law at intermediate impact velocities (v approximately=0.4 au) as observed in electron spectroscopy experiments.