The techniques of many-body perturbation theory with interacting resonances are used to calculate the photoionization cross section of SiII from threshold to 1 keV. The Rayleigh-Schr\"odinger expansion with LS coupled states and the Brueckner-Goldstone expansion are compared. Correlations among the $2p$, $3s$, and $3p$ electrons are shown to have a large effect on the cross section. Resonances from 3s 3p np, 2p⁵3s²3p ns, 2p⁵3s²3p nd, and 2s 2p⁶3s²3p np configurations are included.
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Daum et al. (1976) studied this question.
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