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
54Fe 53.939612 5.82% 0 56Fe 55.934939 91.18% 0 57Fe 56.935396 2.1 % 1/2 +0.09044 58Fe 57.933277 0.28% 0
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