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| NIST Atomic Spectra Database Ionization Energies Data
Fe (all spectra) |
Example of how to reference these results:
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2024). NIST Atomic Spectra Database (ver. 5.12), [Online]. Available: https://physics.nist.gov/asd [2025, March 21]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
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At. num | El. Name | Isoel. Seq. | Ground Shells (a) | Ground Level | Ionization Energy (eV) | Uncertainty (eV) | References
--------|----------|-------------|-------------------|--------------|--------------------------------------|----------------------|--------------
26 | Iron | Fe | [Ar].3d6.4s2 | 5D<4> | 7.9024681 | 0.0000012 | L7743c109
26 | Iron | Mn | [Ar].3d6.4s | 6D<9/2> | 16.19921 | 0.00005 | L18349
26 | Iron | Cr | [Ar].3d6 | 5D<4> | 30.651 | 0.012 | L7185,L1171
26 | Iron | V | [Ar].3d5 | 6S<5/2> | 54.91 | 0.04 | L17209
26 | Iron | Ti | [Ar].3d4 | 5D0 | [75.00] | 0.15 | L7185,L241
26 | Iron | Sc | [Ar].3d3 | 4F<3/2> | 98.985 | 0.015 | L17209
26 | Iron | Ca | [Ar].3d2 | 3F<2> | 124.9671 | 0.0025 | L22066,L5267
26 | Iron | K | [Ar].3d | 2D<3/2> | 151.060 | 0.012 | L7185
26 | Iron | Ar | [Ne].3s2.3p6 | 1S0 | [233.6] | 0.4 | L7185
26 | Iron | Cl | [Ne].3s2.3p5 | 2P*<3/2> | [262.10] | 0.12 | L7185
26 | Iron | S | [Ne].3s2.3p4 | 3P<2> | [290.9] | 0.4 | L11770
26 | Iron | P | [Ne].3s2.3p3 | 4S*<3/2> | [330.8] | 0.6 | L11770
26 | Iron | Si | [Ne].3s2.3p2 | 3P0 | [361.0] | 0.7 | L7185
26 | Iron | Al | [Ne].3s2.3p | 2P*<1/2> | [392.2] | 0.7 | L7185
26 | Iron | Mg | [Ne].3s2 | 1S0 | 456.2 | 0.5 | L17943
26 | Iron | Na | [Ne].3s | 2S<1/2> | [489.312] | 0.014 | L11770
26 | Iron | Ne | 1s2.2s2.2p6 | 1S0 | [1262.7] | 0.7 | L11770
26 | Iron | F | 1s2.2s2.2p5 | 2P*<3/2> | [1357.8] | 1.9 | L11770
26 | Iron | O | 1s2.2s2.2p4 | 3P<2> | [1460] | 3 | L11770
26 | Iron | N | 1s2.2s2.2p3 | 4S*<3/2> | 1575.6 | 0.5 | L7185
26 | Iron | C | 1s2.2s2.2p2 | 3P0 | [1687.0] | 1.0 | L11770
26 | Iron | B | 1s2.2s2.2p | 2P*<1/2> | [1798.4] | 0.8 | L11770
26 | Iron | Be | 1s2.2s2 | 1S0 | [1950.4] | 1.8 | L11770
26 | Iron | Li | 1s2.2s | 2S<1/2> | (2045.759) | 0.007 | L16264c99
26 | Iron | He | 1s2 | 1S0 | (8828.1864) | 0.0012 | L21139
26 | Iron | H | 1s | 2S<1/2> | (9277.6886) | 0.0003 | L19200
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Notes:
(a) Designations used in the ground shell lists:
[Ne] = 1s2.2s2.2p6
[Ar] = 1s2.2s2.2p6.3s2.3p6
If you did not find the data you need, please inform the ASD Team.
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