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
36Ar 35.967545 0.337% 0 38Ar 37.962732 0.063% 0 40Ar 39.962384 99.600% 0
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