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
138La 137.907105 0.09% 5 +3.707 139La 138.906346 99.10% 7/2 +2.778
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