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

We have calculated the cross sections for the production of (2lnl'), with n = 3, 4 and 5, and (3l3l') states by double electron capture in C6+ -He collisions at low impact energies. Our 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 ≅ 0.4 au) as observed in electron spectroscopy experiments. (author)