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

S (all spectra)
16 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) 
  83 559.170         
  188 232.7           
  [281 130]            
  [380 870]            
  585 514.1           
  710 194.7           
  2 266 050             
  2 651 900             
  [3 063 600]            
  [3 611 300]            
  [4 069 500]            
  [4 552 250]            
  [5 258 400]            
  (5 702 290)            
  (26 001 543.8)          
  (28 182 531.02)         
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