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

Kr (all spectra)
36 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) 
  112 914.433         
  196 475.4           
  289 050             
  410 100             
  [521 800]            
  [633 100]            
  (880 200)            
  1 014 665             
  [1 879 000]            
  (2 163 000)            
  (2 486 000)            
  (2 824 000)            
  (3 153 000)            
  (3 597 000)            
  (3 967 000)            
  (4 355 000)            
  (4 767 000)            
  (5 162 000)            
  [6 334 000]            
  [6 707 600]            
  [7 120 300]            
  [7 625 000]            
  [8 057 300]            
  [8 407 000]            
  [9 315 400]            
  [9 720 860]            
  [23 623 000]            
  [24 775 000]            
  [26 036 000]            
  [27 269 000]            
  [28 910 000]            
  [30 262 000]            
  [32 027 000]            
  (33 141 990)            
  (139 505 066)            
  (144 665 536)            
Notes:
a Uncertainty of the listed value is unknown.

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