NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Lutetium (Lu)

Atomic Number = 71

Atomic Weight = 174.967

Reference E95

Isotope    Mass        Abundance Spin Mag Moment
175Lu 174.940770 97.41% 7/2 +2.2327 176Lu 175.942679 2.59% 7 +3.19
Lu I  Ground State (1s22s22p63s23p63d104s24p64d104f145s25p6)5d6s2  2D3/2
      Ionization energy  43762.50 cm-1 (5.42586 eV)   Ref. CT72,MMMS89
Lu II Ground State (1s22s22p63s23p63d104s24p64d104f145s25p6)6s2  1S0
      Ionization energy  112000 cm-1 (13.9 eV)   Ref. MZH78