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) | |
Notes
- ↑ 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
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>.
- ↑ 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>.
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