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

K (all spectra)
19 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) 
  35 009.8140         
  255 072.8            
  [369 427]             
  [491 330]             
  [666 700]             
  [802 000]             
  948 200              
  [1 249 100]             
  [1 418 063]             
  [4 062 400]             
  [4 562 000]             
  [5 090 000]             
  [5 764 500]             
  [6 341 600]             
  [6 943 800]             
  [7 804 700]             
  (8 344 140)             
  (37 188 667.6)           
  (39 795 795.4)           
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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