Abstract
The uniform semiclassical approximation is employed to calculate absolute Wannier cross sections for two-electron photodetachment from He- (1s2s2p 4Po5/2) near threshold. This is the first absolute theory in which the initial state involves non-zero total angular momentum: 3Po1 in the initial state and 3Pe1 in the final state. It also permits the first absolute comparison between theoretical and experimental cross sections. The theory predicts a cross section of 1.89 × 10-20 cm2 at an excess photon energy of E = 0.41 eV. This compares favourably with the experimental estimate 2 × 10-20 cm2 of Bae et al. (1983). The cross section, as a function of excess energy E in au, is given by 2.14 E1.127 × 10-18 cm2.
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