NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Argon (Ar)

Atomic Number = 18

Atomic Weight = 39.948

Reference E95

  Isotope   Mass   Abundance   Spin   Mag Moment 

Ar I  Ground State 1s22s22p63s23p6 1S0
       Ionization energy  127109.842 cm-1 (15.759610 eV)   Ref. VHU99

Ar II Ground State 1s22s22p63s23p5 23/2
       Ionization energy  222848.3 cm-1 (27.62966 eV)   Ref. M60b