Single-ionization cross sections for the ground level of the Si⁺ ion. The DI cross sections were obtained in the potential of the ionized ion. The solid (green) line represents the total LLDW cross sections, the dashed (green) line represents the LLDW DI cross sections, the dashed-dotted (blue) line represents the total CADW cross sections (Djurić et al. 1993), and the dotted (blue) line represents the DI CADW cross sections (Djurić et al. 1993). Experiment is shown by open circles with error bars (Djurić et al. 1993).