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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 (2024). NIST Atomic Spectra Database (ver. 5.12), [Online]. Available: https://physics.nist.gov/asd [2026, June 13]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 Ionization  Energy 
 (eV) 
  15.7596119              
  27.62967                
  [40.735]                 
  [59.58]                  
  [74.84]                  
  91.290                  
  [124.41]                  
  [143.4567]                
  [422.60]                  
  [479.76]                  
  [540.4]                   
  [619.0]                   
  [685.5]                   
  [755.13]                  
  [855.5]                   
  (918.375)                 
  (4 120.66559)               
  (4 426.22407)               
Notes:
a Uncertainty of the listed value is unknown.

If you did not find the data you need, please inform the ASD Team.

[ASD Home][Lines Query][Levels Query][List of Spectra][Ground States and Ionization Energies][Bibliography][Help] NIST Physical Measurement Laboratory