NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Europium (Eu)

Atomic Number = 63

Atomic Weight = 151.965

Reference E95

Isotope    Mass        Abundance Spin Mag Moment
151Eu 150.919847 47.8% 5/2 +3.464 153Eu 152.921225 52.2% 5/2 +1.530
Eu I  Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f76s2  87/2
      Ionization energy  45734.74 cm-1 (5.67038 eV)   Ref. NRCA00
Eu II Ground State (1s22s22p63s23p63d104s24p64d105s25p6)4f76s  94
      Ionization energy  90700 cm-1 (11.25 eV)   Ref. SR65