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)[1] unless otherwise noted, and converted using the 2006 CODATA recommended values:[2][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) [3][4]
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 21.564 539(7) 2080.6619(7) [1][5]
11 Sodium 5.137 9515(37) 493.295 10(36)
89 Actinium 5.3807(3) 159.16(3) [6]
90 Thorium 6.3067(2) 608.50(2) [7]
91 Protactinium 5.89(12) 568(12) [8]
93 Neptunium 6.2655(2) [7]
94 Plutonium 6.0258(2) [7]
95 Americium 5.9738(2) [7][9][10]
96 Curium 5.9915(2) [7][9][10]
97 Berkelium 6.1979(2) 598.01(2) [7][10]
98 Californium 6.2817(2) [7][10]
99 Einsteinium 6.3676(5) [10][11]

Notes

  1. ↑ 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.

References

  1. ↑ 1.0 1.1 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>.
  2. ↑ 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>.
  3. ↑ 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.
  4. ↑ 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.
  5. ↑ Kaufman, Victor; Minnhagen, Lennart Accurate Ground-Term Combinations in Ne I. J. Opt. Soc. Am. 1972, 62 (1), 92–95. DOI: 10.1364/JOSA.62.000092.
  6. ↑ 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.
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 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.
  8. ↑ Sugar, Jack Ionization energies of the neutral actinides. J. Chem. Phys. 1973, 59, 788–91. DOI: 10.1063/1.1680091. Sugar, Jack Revised ionization energies of the neutral actinides. J. Chem. Phys. 1974, 60, 4103. DOI: 10.1063/1.1680874.
  9. ↑ 9.0 9.1 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.
  10. ↑ 10.0 10.1 10.2 10.3 10.4 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.
  11. ↑ 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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