Comparison of theoretical and experimental (Bizau et al. 2015) SPI and DPI cross sections of O²⁺. a) SPI cross section compared with the relative measurement with 110 meV BP, b) DPI cross section (being convolved with a Gaussian profile of 110 and 350 meV FWHM) compared with the absolute measurement with 350 meV BP. The vertical bars indicate the statistical uncertainties of the experiment. The relative population fraction of the initial state were diagnosed to be 71.5% ³P, 19% ¹D, and 9.5% ¹S of configuration 1s²2s²2p². To have the best comparison with the experiment, the theoretical resonance positions have been shifted to lower energy direction according to the experimental results by 1.894 eV for ³P–, 1.694 eV for ¹S–, 1.656 eV for ¹D–, 1.632 eV for ³P–, 2.188 eV for ³P– and 2.070 eV for ¹D–.