Electron capture by O3+ ions from He, H2O and CO2

Abstract

Using the translational energy-gain spectroscopy technique, we have measured the energy-gain spectra and absolute total cross sections for single-electron capture in collisions of O3+ ions with He, H2O and CO2 at impact energies between 0.3 and 1.2 keV and scattering angles between 0° and 6°. At the lowest collision energy, 300 eV, the energy-gain spectrum for O3+ - He collisions indicates that single-electron capture into the 2s2p3 3P state of the product O2+ is the dominant reaction channel observed with smaller contributions from capture into the 2s2p3 1D, 3S and 1P states. For O3+ - H2O collisions, the dominant peak correlates with capture into the 2p3p state of O2+, with a significant contribution involving capture into the 2p3s state. In O3+ - CO2 collisions, the dominant reaction channel is due to capture into the 2p3s state of O2+, with contributions from capture into the 2p3p state. The measured cross sections are compared with the available measurements and theoretical results based on the multi-channel Landau-Zener (MCLZ) model.