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  2P°3/2
      Ionization energy  222848.3 cm-1 (27.62966 eV)   Ref. M60b