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National Institute of Standards and Technology NIST Physical Measurement Laboratory
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, October 26]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 Ionization  Energy 
 (cm-1) 
  127 109.842         
  222 848.3           
  [328 550]            
  [480 560]            
  [603 660]            
  736 300             
  [1 003 450]            
  [1 157 056]            
  [3 408 480]            
  [3 869 500]            
  [4 358 900]            
  [4 992 200]            
  [5 528 700]            
  [6 090 500]            
  [6 899 800]            
  (7 407 190)            
  (33 235 409.4)          
  (35 699 904.7)          
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