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NIST Atomic Spectra Database
Ionization Energies Data

Ar (all spectra)
18 Data Rows Found 

Example of how to reference these results:
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2018). NIST Atomic Spectra Database (ver. 5.6.1), [Online]. Available: https://physics.nist.gov/asd [2019, August 21]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 At. Num.   El.  name   Isoel.  Seq.   Ground  Shells a   Ground  Level   Ionization  Energy 
 (eV) 
Uncertainty
 (eV) 
 References 
18  Argon  Ar  [Ne]3s23p6   1S0    15.7596117                 0.0000005   L9217 
18  Argon  Cl  [Ne]3s23p5   23/2    27.62967                   0.00012     L8844 
18  Argon  [Ne]3s23p4   3P2    [40.735]                    0.012       L8114 
18  Argon  [Ne]3s23p3   43/2    [59.58]                     0.18        L11770 
18  Argon  Si  [Ne]3s23p2   3P0    [74.84]                     0.17        L11770 
18  Argon  Al  [Ne]3s23p   21/2    91.290                     0.010       L12277 
18  Argon  Mg  [Ne]3s2   1S0    [124.41]                     0.06        L11770 
18  Argon  Na  [Ne]3s   2S1/2    [143.4567]                   0.0012      L4344 
18  Argon  Ne  1s22s22p6   1S0    [422.60]                     0.06        L11770 
18  Argon  1s22s22p5   23/2    [479.76]                     0.12        L11242c99 
18  Argon  1s22s22p4   3P2    [540.4]                      0.6         L11770 
18  Argon  1s22s22p3   43/2    [619.0]                      0.4         L11770 
18  Argon  1s22s22p2   3P0    [685.5]                      0.3         L11770 
18  Argon  1s22s22p   21/2    [755.13]                     0.22        L11770 
18  Argon  Be  1s22s2   1S0    [855.5]                      0.3         L11770 
18  Argon  Li  1s22s   2S1/2    (918.375)                    0.007       L16264c99 
18  Argon  He  1s2   1S0    (4 120.6656)                   0.0004      L12128 
18  Argon  1s   2S1/2    (4 426.2228)                   0.0007      L7188 
Notes:
Designations used in the ground shell lists:
[Ne] = 1s22s22p6

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