NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Lanthanum (La)

Atomic Number = 57

Atomic Weight = 138.9055

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

La I  Ground State (1s22s22p63s23p63d104s24p64d105s25p6)5d6s2 2D3/2
       Ionization energy  44981 cm-1 (5.5769 eV)   Ref. MZH78

La II Ground State (1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6) 5d2 3F2
       Ionization energy  89200 cm-1 (11.059 eV)   Ref. SR65