State-selective single-electron capture in Ne⁴⁺-He collisions

A cold-target recoil-ion momentum spectroscopy technique (COLTRIMS), capable of measuring simultaneously the energy-gain and the scattering angle of the projectile products, has been used for the study of state-selective single-electron capture from He by 8 keV Ne⁴⁺ ions. The dominant reaction channel is due to single-electron capture into the 3s ⁴P state of the Ne³⁺ from the ground state incident Ne⁴⁺ ions. Also, there is clear evidence of capture into the 3s ²P state. State-selective differential cross-sections for capture into the 3s ⁴P and ²P states have also been measured and compared with the semi-classical multichannel Landau-Zener calculations.