NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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

Homepage - IntroductionFinding listSelect element by name.Select element by atomic number.Select element from periodic tableArgon Atomic DataArgon Strong LinesArgon Neutral Atom Persistent LinesArgon Neutral Atom Energy LevelsArgon Singly Ionized Persistent LinesArgon Singly Ionized Energy LevelsArgon References
Switch to ASCII Version

Atomic Data for Argon (Ar)

Atomic Number = 18

Atomic Weight = 39.948

Reference E95


  Isotope   Mass   Abundance   Spin   Mag Moment 
              
36Ar35.9675450.337%0 
38Ar37.9627320.063%0 
40Ar39.96238499.600%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