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NIST Atomic Spectra Database
Ionization Energies Data

In (all spectra)
49 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) 
  46 670.107         
  152 200.10          
  226 191.3           
  447 200             
  [559 000]            
  (726 000)            
  (879 000)            
  (1 049 000)            
  (1 258 000)            
  (1 436 000)            
  (1 621 000)            
  (1 823 000)            
  (2 008 000)            
  (2 750 000)            
  (2 968 000)            
  (3 194 000)            
  (3 428 000)            
  (3 726 000)            
  [4 009 500]            
  (4 517 000)            
  [4 785 900]            
  (8 412 000)            
  (8 945 000)            
  (9 525 000)            
  (10 122 000)            
  (10 711 000)            
  (11 397 000)            
  (12 066 000)            
  (12 703 000)            
  (13 381 000)            
  (14 018 000)            
  [15 820 000]            
  [16 360 600]            
  [17 025 100]            
  [17 803 000]            
  [18 690 200]            
  [19 138 000]            
  [20 610 200]            
  [21 202 490]            
  [49 413 000]            
  [51 066 000]            
  [52 865 000]            
  [54 582 000]            
  [58 039 000]            
  [60 021 000]            
  [62 542 000]            
  (64 146 380)            
  (264 853 050)            
  (272 215 370)            
Notes:
a Uncertainty of the listed value is unknown.

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