title: A simple formula for calculating the ionization potential of two-electron ions.
abstract: The ionization potential of one-electron ions can be calculated from a well-known simple equation, but no such equation has been available for calculating the ionization potential of multi-electron ions. I report here an equation that accurately gives the ionization potential of helium-like (i.e., two-electron) ions as a function of the atomic number, the relative difference from experimental values being below 1% for all ions for which reliable experimental data were found (Z = 3-29). The equation also predicts the stability of the negative hydrogen ion (the hydride ion), H(-), although with twice too large a value for the ionization potential.
authors.affiliation: Faculty of Pharmacy, University of Helsinki, P.O. Box 56 (Biocenter 2), 00014, Helsinki, Finland. hannu.elo@helsinki.fi
authors.forename: Hannu
authors.initials: H
authors.lastname: Elo
mesh_terms: D004581:Electronics / Q000379:methods*; D004583:Electrons; D007477:Ions; D008962:Models, Theoretical; D008970:Molecular Weight
chemical_list: D007477:Ions