A hyperspherical close-coupling calculation of photoionization from the He atom, Li⁺and C⁴⁺ions. II. Between the N=2 and N=3 thresholds

Abstract

For pt.I see ibid., vol.26, no.16, PO 2555-73 (1993). The authors report an extensive calculation of photoionization cross sections of the He atom and He-like ions, Li+ and C4+, using the hyperspherical close-coupling (HSCC) method for photon energies between the N=2, 3 thresholds. Rich resonance structures in the spectra are readily identified with the autoionizing doubly excited states associated with the N=3 manifold. Some systematic trends in the photoionization spectra with the nuclear charge are uncovered and discussed.