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 

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