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We have measured photoionization branching ratios and photoelectron asymmetry parameters for photoionization of CO2 leading to the first four electronic states of CO2+ over the photon energy range from 20 to 50 eV. The motivation for this work was the prediction by Lucchese J. Chem. Phys. 92, 4203 (1990) that the σu shape resonance in the (4σg)−1 C̃ 2Σg+ ionization channel would influence the photoionization dynamics in the other valence-shell continua through continuum–continuum channel interaction, with the main effect occurring in the (3σu)−1 B̃ 2Σu+ channel. Indeed, clear evidence for this phenomenon is observed in this channel, the most prominent indication being a broad, shallow minimum in the asymmetry parameter at ∼40 eV. Comparisons of the present results with theory and other measurements reflect good overall agreement and provide some guidance regarding the effectiveness of alternative approximations used in the theoretical calculations.
Siggel et al. (1993) studied this question.