STATE-SELECTIVE ELECTRON-CAPTURE IN HE2+ -H2 COLLISIONS

A classical phase-space model of the hydrogen molecule which includes both electrons and nuclear centers is utilized to study state selective electron capture for collisions with alpha particles at intermediate impact energies (30-200 keV amu-1). The calculations am performed within the framework of the classical trajectory Monte Carlo method. The direct one-electron transfer process and the transfer ionization reaction which becomes increasingly important at the higher impact energies are directly included in the cross section determinations. Photon emission spectroscopy experiments were conducted to obtain line emission cross sections for capture to the He+(np) states, n = 2-5, for energies from 16 to 60 keV amu-1. Agreement between theory and available experimental data is good at energies above 40 keV amu-1.