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

P (all spectra)
15 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) 
  84 580.83         
  [159 451.7]         
  243 600.7          
  414 922.8          
  524 462.9          
  [1 777 891]           
  [2 125 800]           
  [2 497 100]           
  [3 002 900]           
  [3 423 000]           
  [3 866 950]           
  [4 521 700]           
  (4 934 020)           
  (22 719 900.7)         
  (24 759 946.70)        
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