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National Institute of Standards and Technology NIST Physical Measurement Laboratory
NIST Atomic Spectra Database
Ionization Energies Data

V (all spectra)
23 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) 
  54 411.67         
  118 030            
  236 410            
  376 730            
  526 532.0          
  1 033 400            
  [1 215 660]           
  [1 399 800]           
  [1 661 200]           
  [1 859 000]           
  [2 055 100]           
  [2 488 200]           
  [2 712 233]           
  7 227 000            
  [7 881 700]           
  [8 573 000]           
  [9 398 200]           
  [10 153 400]           
  [10 922 100]           
  [11 990 800]           
  (12 660 130)           
  (55 259 551.2)         
  (58 443 949.6)         
Notes:
a Uncertainty of the listed value is unknown.

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

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