NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Iron (Fe)

Atomic Number = 26

Atomic Weight = 55.847

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 
57Fe56.9353962.1 %1/2+0.09044

Fe I  Ground State 1s22s22p63s23p63d64s2 5D4
       Ionization energy  63737 cm-1 (7.9024 eV)   Ref. SC85

Fe II Ground State 1s22s22p63s23p63d64s 6D9/2
       Ionization energy  130563 cm-1 (16.1877 eV)   Ref. SC85