Ionisation energies of atomic helium and two-electron atomic ions are calculated from the equation: J/hcRM={(Z–S2)–S2[Z2–(Z–S2)]–✓(α2/Z¡)}[1 +α2(Z– 1)(Z– 2)/4], where S= 0.5 is the repulsion or screening constant.
M. E. S. Ali, P. F. Lang and B. C. Smith, J. Chem. Soc., Faraday Trans. 2, 1984, 80, 1089 DOI: 10.1039/F29848001089
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