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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 (2019). NIST Atomic Spectra Database (ver. 5.7.1), [Online]. Available: https://physics.nist.gov/asd [2020, September 25]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 At. Num.   Ion  Charge   El.  name   Ionization  Energy 
 (eV) 
Uncertainty
 (eV) 
 References 
18  Argon    15.7596117                 0.0000005   L9217 
18  +1  Argon    27.62967                   0.00012     L8844 
18  +2  Argon    [40.735]                    0.012       L8114 
18  +3  Argon    [59.58]                     0.18        L11770 
18  +4  Argon    [74.84]                     0.17        L11770 
18  +5  Argon    91.290                     0.010       L12277 
18  +6  Argon    [124.41]                     0.06        L11770 
18  +7  Argon    [143.4567]                   0.0012      L4344 
18  +8  Argon    [422.60]                     0.06        L11770 
18  +9  Argon    [479.76]                     0.12        L11242c99 
18  +10  Argon    [540.4]                      0.6         L11770 
18  +11  Argon    [619.0]                      0.4         L11770 
18  +12  Argon    [685.5]                      0.3         L11770 
18  +13  Argon    [755.13]                     0.22        L11770 
18  +14  Argon    [855.5]                      0.3         L11770 
18  +15  Argon    (918.375)                    0.007       L16264c99 
18  +16  Argon    (4 120.6656)                   0.0004      L12128 
18  +17  Argon    (4 426.2228)                   0.0007      L7188 

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