Photoionization and photoabsorption cross sections of CO2at 584 A

Total absorption and photoionization cross sections of CO2 have been measured at 584 A. When the present data are combined with previously published data, preferred values for the total absorption cross section and photoionization efficiency are found to be (33 ± 1.5) × 10−18 cm² and 1.02 ± 0.04, respectively. In addition, the photoelectron spectrum of CO2 was obtained to provide the absolute probabilities for the production of CO2+ ions in their ground X²Πg state and excited A²Πu, B²Σu+, and C²Σg+ states. These results are discussed in relationship to the fluorescent emissions observed from CO2+.