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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 (2013). NIST Atomic Spectra Database (ver. 5.1), [Online]. Available: http://physics.nist.gov/asd [2014, April 23]. National Institute of Standards and Technology, Gaithersburg, MD.
BibTex Citation (new window)
 

 At. Num.   El.  name   Isoel.  Seq.   Ground  Shells a   Ground  Level   Ionization  Energy b 
 (eV) 
 References 
26  Iron  Fe  [Ar]3d64s2   5D4    7.9024678(12)            L7743c109 
26  Iron  Mn  [Ar]3d64s   6D9/2    16.19920(5)               L18349 
26  Iron  Cr  [Ar]3d6   5D4    30.651(12)                L7185,L1171 
26  Iron  [Ar]3d5   6S5/2    54.91(4)                  L17209 
26  Iron  Ti  [Ar]3d4   5D0    [75.0(2)]                  L7185,L241 
26  Iron  Sc  [Ar]3d3   4F3/2    98.985(15)                L17209 
26  Iron  Ca  [Ar]3d2   3F2    124.98(1)                  L7185,L5267 
26  Iron  [Ar]3d   2D3/2    151.060(12)                L7185 
26  Iron  Ar  [Ne]3s23p6   1S0    [233.6(4)]                  L7185 
26  Iron  Cl  [Ne]3s23p5   23/2    [262.10(12)]                L7185 
26  Iron  [Ne]3s23p4   3P2    [290.9(4)]                  L11770 
26  Iron  [Ne]3s23p3   43/2    [330.8(6)]                  L11770 
26  Iron  Si  [Ne]3s23p2   3P0    [361.0(7)]                  L7185 
26  Iron  Al  [Ne]3s23p   21/2    [392.2(7)]                  L7185 
26  Iron  Mg  [Ne]3s2   1S0    456.2(5)                   L17943 
26  Iron  Na  [Ne]3s   2S1/2    [489.312(14)]               L11770 
26  Iron  Ne  1s22s22p6   1S0    [1 262.7(7)]                  L11770 
26  Iron  1s22s22p5   23/2    [1 357.8(19)]                 L11770 
26  Iron  1s22s22p4   3P2    [1 460(3)]                    L11770 
26  Iron  1s22s22p3   43/2    1 575.6(5)                   L7185 
26  Iron  1s22s22p2   3P0    [1 687.0(10)]                 L11770 
26  Iron  1s22s22p   21/2    [1 798.4(8)]                  L11770 
26  Iron  Be  1s22s2   1S0    [1 950.4(18)]                 L11770 
26  Iron  Li  1s22s   2S1/2    (2 045.759(7))                L16264c99 
26  Iron  He  1s2   1S0    (8 828.1875(11))              L12128 
26  Iron  1s   2S1/2    (9 277.6814(25))              L7188 
Notes:
Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6
Uncertainty is given in parentheses after the value. It is expressed in the units of the last decimal place of the value.

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