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