Ion-Impact Energy-Loss Spectrum of Oxygen

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Abstract
Electronic transitions in the oxygen molecule arising from ion—molecule collisions have been studied by measuring the kinetic energy lost by 100 eV–4 keV H+, H2 +, and He+ inelastically scattered from O2. The 7–9‐eV region of the energy‐loss spectrum is strongly collision‐energy dependent. The broad feature ordinarily identified as the Schumann—Runge continuum appears to be the result of at least two different transitions. A peak corresponding to the optically forbidden Herzberg continuum (A 3 Σ u + ←X 3 Σ g − ) is observed in all of the ion‐impact spectra. Triplet—singlet transitions into the a 1Δ g and b 1 Σ g + states are the most intense features of the H 2 + − and He+−impact spectra. Cross sections for the above‐mentioned processes exceed 10−17 cm2.