Measurement of electron-impact excitation in boronlike carbon

Abstract
We have measured the cross section for the electron-impact excitation of C+(2s22p 2P°→2s2p2 )2 in a colliding-beams apparatus for several collision energies near the threshold for the process. We find a cross section of (1.1±0.3)×1016 cm2 at threshold. Reasonable agreement is found with close-coupling calculations.