Two-electron ionization threshold

In the former case, our results were the first ab initio quantum mechanical predictions, and they were verified by fhe experimental resonance spectrum measured by Buckman and Newman [169]. By computing conditional probabilities, it was explicitly demonstrated [165] for the first time that as energy increases, the two-electrons in the Isnt intrashell states of He fhaf have the lowest energy in each shell reach the two-electron ionization threshold with the Wannier geometry of ri = r2 and Ou = 180°. 

Table 4.4 lists the theoretical predictions for the positions of the He Isni TEIL states [165] and the experimental energies [169] which confirmed them (in eV). These are calculated with respect to the two-electron ionization threshold of 24.588 eV. 

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