Electron capture into excited projectile states in 6-100 keV Ne4+-Ne collisions

Abstract

The collision system Ne4+-Ne has been studied both theoretically and experimentally. The cross section for one-electron capture into Ne3+ (3s,3p) subshells has been determined in the velocity range 0.1-0.5 au by measuring the VUV photons emitted by these excited states. Quasimolecular diabatic two-electron 1 Sigma g states were calculated in a wide range of internuclear distances. The interaction between crossing diabatic states was obtained by calculating adiabatic splittings in the two configuration approximation. The cross sections for one- and two-electron capture into 3s,3p subshells were calculated using a multichannel Landau-Zener model. Good agreement exists between experimental and theoretical results for one-electron capture.