EXTENSIVE L2 CALCULATION OF PARTIAL PHOTOIONIZATION CROSS-SECTIONS OF HE IN THE 4LNL' RESONANCE REGION

We present a fully-L2-integrable calculation of the partial photoionization cross sections of He between the N = 3 and 4 thresholds. The energy positions, total and partial autoionization widths, and Fano and Starace parameters for the 4lnl' doubly excited states lying in this region are also provided. We have found that only one series of resonances with large autoionization widths is observed in the total-cross-section spectrum. On the other hand, several resonance series are exhibited in the partial N = 3 cross sections. Our results also show that the 2p and 3p cross sections dominate the N = 2 and 3 ones, respectively. Good agreement with the existing experimental data is found.