Luminescence measurements of hyperthermal Xe + O and O + Xe collision systems

Emission excitation cross sections are recorded for collisions between Xe 2+ + O 2 and O + + Xe over a collision energy range of approximately 2 to 900 eV in the center-of-mass ( E cm ) frame. Emissive products of the O + + Xe reaction are examined in the 700-1000 nm optical range and include neutral atomic oxygen emissions and neutral xenon emissions. Atomic emission products of the O + + Xe collision appear to have measureable cross sections near E cm = 14 eV and increase in intensity until about E cm = 60 eV where they remain approximately constant for the remainder of the measured collision energies. For the Xe 2+ + O 2 collision system, O 2 + charge transfer products are measured through fluorescence of the O 2 + (A-X) and (b-a) manifolds over the 200-850 nm window. Total cross sections for both manifolds do not vary beyond the experimental precision at all measured energies. Vibrational populations are derived from a fitting of the experimental data. The populations are found to deviate from a Franck-Condon distribution at all collision energies and appear to be well-modeled within a multi-channel Landau-Zener framework over the collision energy range measured. Vibrational state collision energy dependence of Xe/O collision systems.