H2S PHOTOABSORPTION AND PHOTOIONIZATION CROSS-SECTIONS BY STIELTJES IMAGING

Photoabsorption and photoionization cross sections of H2S have been calculated by using extended basis sets of integrable functions and the Stieltjes imaging procedure. The calculations were performed in static-exchange approximation (SEA) and random-phase approximation (RPA) and the excitation spectrum was obtained either in the single-channel or in the multichannel approach. The gauge dependence of the SEA results tends to inhibit a reliable assessment of the channel interaction effects. The situation is noticeably improved in the RPA where the gauge dependence of the results, even in the single-channel approximation, is considerably lessened