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NIST Atomic Spectra Database
Ionization Energies Data

Fe (all spectra)
26 Data Rows Found 
Example of how to reference these results:
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2023). NIST Atomic Spectra Database (ver. 5.11), [Online]. Available: https://physics.nist.gov/asd [2024, April 25]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 At. Num.   El.  name   Isoel.  Seq.   Ground  Shells a   Ground  Level   Ionization  Energy 
 (eV) 		 Uncertainty
 (eV) 		  References 
26  Iron  Fe  [Ar]3d64s2   5D4    7.9024681                 0.0000012   L7743c109 
26  Iron  Mn  [Ar]3d64s   6D9/2    16.19921                   0.00005     L18349 
26  Iron  Cr  [Ar]3d6   5D4    30.651                     0.012       L7185,L1171 
26  Iron  V  [Ar]3d5   6S5/2    54.91                      0.04        L17209 
26  Iron  Ti  [Ar]3d4   5D0    [75.00]                     0.15        L7185,L241 
26  Iron  Sc  [Ar]3d3   4F3/2    98.985                     0.015       L17209 
26  Iron  Ca  [Ar]3d2   3F2.000    124.9671                    0.0025      L22066,L5267 
26  Iron  K  [Ar]3d   2D3/2    151.060                     0.012       L7185 
26  Iron  Ar  [Ne]3s23p6   1S0    [233.6]                      0.4         L7185 
26  Iron  Cl  [Ne]3s23p5   2P°3/2    [262.10]                     0.12        L7185 
26  Iron  S  [Ne]3s23p4   3P2    [290.9]                      0.4         L11770 
26  Iron  P  [Ne]3s23p3   4S°3/2    [330.8]                      0.6         L11770 
26  Iron  Si  [Ne]3s23p2   3P0    [361.0]                      0.7         L7185 
26  Iron  Al  [Ne]3s23p   2P°1/2    [392.2]                      0.7         L7185 
26  Iron  Mg  [Ne]3s2   1S0    456.2                       0.5         L17943 
26  Iron  Na  [Ne]3s   2S1/2    [489.312]                    0.014       L11770 
26  Iron  Ne  1s22s22p6   1S0    [1 262.7]                      0.7         L11770 
26  Iron  F  1s22s22p5   2P°3/2    [1 357.8]                      1.9         L11770 
26  Iron  O  1s22s22p4   3P2    [1 460]                        3           L11770 
26  Iron  N  1s22s22p3   4S°3/2    1 575.6                       0.5         L7185 
26  Iron  C  1s22s22p2   3P0    [1 687.0]                      1.0         L11770 
26  Iron  B  1s22s22p   2P°1/2    [1 798.4]                      0.8         L11770 
26  Iron  Be  1s22s2   1S0    [1 950.4]                      1.8         L11770 
26  Iron  Li  1s22s   2S1/2    (2 045.759)                    0.007       L16264c99 
26  Iron  He  1s2   1S0    (8 828.1864)                   0.0012      L21139 
26  Iron  H  1s   2S1/2    (9 277.6886)                   0.0003      L19200 
Notes:
a Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6

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