Cross sections for producing CO+2 (A 2Π–X 2Π) and CO+2 (B 2Σ–X 2Π) fluorescence by photoionization of CO2

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Abstract
Cross sections have been measured with 0.5 Å resolution between 584 Å and respective thresholds for CO+2 A and B excited states as they fluoresce to the CO+2 ground state. Beutler–Fano resonance profiles are observed in both cross sections converging to the CO+2 C 2Σ ion limit at 640 Å. Characteristics of the initial and final states involved in the ionization process are discussed in detail. The ratio of the absolute magnitudes of the A:B fluorescence cross sections reported in this work is in excellent agreement with results of previous workers near 584 Å, pointing up a fundamental discrepancy between initial and final state measurements of CO+2 A and B excited state populations.