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NIST Atomic Spectra Database
Ionization Energies Data

Cl (all spectra)
17 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) 
  104 591.01         
  192 070.0          
  [320 970]           
  [429 430]           
  [545 840]           
  [781 900]           
  921 096            
  2 809 280            
  3 233 080            
  [3 683 400]           
  [4 274 500]           
  [4 771 400]           
  [5 293 400]           
  [6 051 000]           
  (6 526 620)           
  (29 506 531.5)         
  (31 828 989.8)         
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