Oscillator strengths and integral cross sections of the valence-shell excitations of oxygen molecule studied by fast electron and X-ray scattering

The oscillator strengths and integral cross sections of the Schumann-Runge continuum, Longest-Band and Second-Band of oxygen molecule have wide applications in the studies of the Earth's atmosphere and the stellar atmospheres, but there still exist apparent discrepancies among the available data. In this work, the generalized oscillator strengths of the valence-shell excitations of oxygen have been determined independently by the high-energy electron scattering and high-resolution inelastic X-ray scattering. Based on the cross-checked generalized oscillator strengths, the optical oscillator strengths and integral cross sections of these excitations have been obtained, which give an independent cross-check to the previous experimental and theoretical results. (author)