Data:First ionization energies of the elements

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Further information: Ionization energy

Data are taken from the wavenumber compilation of Moore (1970) unless otherwise noted, and converted using the 2006 CODATA recommended values:[1][Note 1]

1 cm−1 = 0.000 123 984 1875(31) eV = 0.011 903 713 931(12) kJ mol−1
Z Element Ionization energy Ref.
(eV) (kJ mol−1)
1 Hydrogen 13.598 432 44(36) 1305.584 631(12)
2 Helium 24.587 3985(14) 2360.634 56(12)
3 Lithium 5.391 718 96(64) 517.658 593(60)
4 Beryllium 9.322 6277(13) 895.064 89(12)
5 Boron 8.298 024(18) 800.6377(17) [2][3]
6 Carbon 11.260 296(12) 796.6930(12)
7 Nitrogen 14.534 096(12) 1395.4176(12)
8 Oxygen 13.618 0537(74) 1307.468 47(71)
9 Fluorine 17.422 816(50) 1672.7634(48)
10 Neon [Note 2]
89 Actinium 5.3807(3) [4]
90 Thorium 6.3067(2) [5]
93 Neptunium 6.2655(2) [5]
94 Plutonium 6.0258(2) [5]
95 Americium 5.9738(2) [5][6][7]
96 Curium 5.9915(2) [5][6][7]
97 Berkelium 6.1979(2) [5][7]
98 Californium 6.2817(2) [5][7]
99 Einsteinium 6.3676(5) [7][8]

Notes

  1. Jump up ↑ Moore used the conversion factor 1 cm−1 = 0.000 123 981 eV, which is 26 ppm lower than the current value. Moore's value in electronvolts are widely reprinted without correction.
  2. Jump up ↑ The results from Moore (1970) were also used in evaluating the weighted mean.

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>.

  1. Jump up ↑ Mohr, Peter J.; Taylor, Barry N.; Newell, David B. CODATA Recommended Values of the Fundamental Physical Constants: 2006. Rev. Mod. Phys. 2008, 80 (2), 633–730. doi:10.1103/RevModPhys.80.633, <http://physics.nist.gov/cuu/Constants/codata.pdf>.
  2. Jump up ↑ Edlén, B.; Ölme, A.; Herzberg, G.; Johns, J. W. C. Ionization Potential of Boron, and the Isotopic and Fine Structure of 2s2p2 2D. J. Opt. Soc. Am. 1970, 60 (7), 889–91. DOI: 10.1364/JOSA.60.000889.
  3. Jump up ↑ Brown, C. M.; Tilford, S. G.; Ginter, M. L. Absorption spectrum of B I in the 1350–1900-Å region. J. Opt. Soc. Am. 1974, 64 (6), 877–79. DOI: 10.1364/JOSA.64.000877.
  4. Jump up ↑ Backe, H.; Dretzke, A.; Eberhardt, K.; Fritzsche, S.; Kube, G.; Gwinner, G.; Haire, R. G.; Huber, G., et al. First Determination of the Ionization Potential of Actinium and First Observation of Optical Transitions in Fermium. J. Nucl. Sci. Technol. 2002, 86–89.
  5. ↑ Jump up to: 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Köhler, S.; Deißenberger, R.; Eberhardt, K.; Erdmann, N.; Herrmann, G.; Huber, G.; Kratz, J. V.; Nunnemann, M., et al. Determination of the first ionization potential of actinide elements by resonance ionization mass spectroscopy. Spectrochim. Acta, Part B 1997, 52 (6), 717–26. DOI: 10.1016/S0584-8547(96)01670-9.
  6. ↑ Jump up to: 6.0 6.1 Deissenberger, Rüdiger; Köhler, Stefan; Ames, Friedhelm; Eberhardt, Klaus; Erdmann, Nicole; Funk, Heike; Herrmann, Günter; Kluge, Heinz-Jürgen, et al. First Determination of the Ionization Potential of Americium and Curium. Angew. Chem., Int. Ed. Engl. 1995, 34 (7), 814–15. DOI: 10.1002/anie.199508141.
  7. ↑ Jump up to: 7.0 7.1 7.2 7.3 7.4 Erdmann, N.; Nunnemann, M.; Eberhardt, K.; Herrmann, G.; Huber, G.; Köhler, S.; Kratz, J. V.; Passler, G., et al. Determination of the first ionization potential of nine actinide elements by resonance ionization mass spectroscopy (RIMS). J. Alloys Compd. 1998, 271–273, 837–40. DOI: 10.1016/S0925-8388(98)00229-1.
  8. Jump up ↑ Peterson, J. R.; Erdmann, N.; Nunnemann, M.; Eberhardt, K.; Huber, G.; Kratz, J. V.; Passler, G.; Stetzer, O., et al. Determination of the first ionization potential of einsteinium by resonance ionization mass spectroscopy (RIMS). J. Alloys Compd. 1998, 271–273, 876–78. DOI: 10.1016/S0925-8388(98)00238-2.
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