NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

[skip navigation] National Institute of Standards and Technology NIST Physical Measurement Laboratory Lanthanum (La) 

Homepage - IntroductionFinding listSelect element by name.Select element by atomic number.Select element from periodic tableLanthanum Atomic DataLanthanum Strong LinesLanthanum Neutral Atom Persistent Lines Lanthanum Neutral Atom Energy LevelsLanthanum Singly Ionized Persistent LinesLanthanum Singly Ionized Energy LevelsLanthanum References
Switch to Formatted Version

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