Data:First ionization energies of the elements

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Data are taken from the wavenumber compilation of Moore (1970) unless otherwise noted, and converted using the 2006 CODATA recommended values:

1 cm−1 = 0.000 124 137 3837(44) eV = 0.011 903 713 931(12) kJ mol−1
Z Element Ionization energy Ref.
(eV) (kJ mol−1)
1 Hydrogen 13.615 234 81(36) 1305.584 631(12)
2 Helium 24.617 7789(14) 2360.634 56(12)
3 Lithium 5.398 381 02(64) 517.658 593(60)

Notes

References

Moore, Charlotte E. Ionization potentials and ionization limits derived from the analyses of optical spectra. Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.) 1970, 34, 1–22, <http://www.nist.gov/data/nsrds/NSRDS-NBS34.pdf>.

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