A simple formula for calculating the ionization potential of two-electron ions |
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Authors: | Hannu Elo |
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Institution: | (1) Faculty of Pharmacy, University of Helsinki, P.O. Box 56 (Biocenter 2), 00014 Helsinki, Finland |
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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. |
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Keywords: | Ionization energy Helium isoelectronic series Dependence of effective nuclear charge on atomic number Helium-like ions |
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