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

Ce (all spectra)
58 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) 
  44 672          
  [88 370]         
  [162 903]         
  [297 670]         
  [528 700]         
  [626 000]         
  (734 000)         
  (855 000)         
  (1 008 000)         
  (1 129 000)         
  (1 387 000)         
  [1 550 500]         
  (2 516 000)         
  (2 742 000)         
  (2 992 000)         
  (3 250 000)         
  (3 509 000)         
  (3 807 000)         
  (4 105 000)         
  (4 380 000)         
  (4 670 000)         
  (4 944 000)         
  (6 041 000)         
  (6 331 000)         
  (6 646 000)         
  (6 952 000)         
  (7 453 000)         
  (7 783 000)         
  (8 549 000)         
  [8 900 600]         
  (15 389 000)         
  (16 083 000)         
  (16 833 000)         
  (17 623 000)         
  (18 389 000)         
  (19 180 000)         
  (20 164 000)         
  (20 970 000)         
  (21 825 000)         
  (22 632 000)         
  (24 898 000)         
  (25 616 000)         
  (26 407 000)         
  (27 149 000)         
  (28 794 000)         
  (29 617 000)         
  (31 173 000)         
  (31 964 000)         
  (72 751 000)         
  (74 760 000)         
  (76 986 000)         
  (79 067 000)         
  (85 027 000)         
  (87 431 000)         
  (90 415 000)         
  (92 429 900)         
  (377 792 560)         
  (386 871 020)         
Notes:
a Uncertainty of the listed value is unknown.

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[ASD Home][Lines Query][Levels Query][List of Spectra][Ground States and Ionization Energies][Bibliography][Help] NIST Physical Measurement Laboratory