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

Cs (all spectra)
55 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) 
  31 406.4677325         
  186 777.4               
  [267 736]                
  (347 000)                
  (452 000)                
  (557 000)                
  (669 000)                
  [887 900]                
  [1 013 100]                
  1 720 250                 
  (1 879 000)                
  (2 105 000)                
  (2 331 000)                
  (2 549 000)                
  (2 839 000)                
  (3 081 000)                
  (3 331 000)                
  (3 589 000)                
  (3 839 000)                
  (4 815 000)                
  (5 073 000)                
  (5 372 000)                
  (5 646 000)                
  (6 073 000)                
  (6 380 000)                
  (7 057 000)                
  [7 388 600]                
  (12 840 000)                
  (13 486 000)                
  (14 171 000)                
  (14 905 000)                
  (15 615 000)                
  (16 365 000)                
  (17 236 000)                
  (17 986 000)                
  (18 785 000)                
  (19 535 000)                
  (21 640 000)                
  (22 317 000)                
  (23 059 000)                
  (23 753 000)                
  (25 148 000)                
  (25 923 000)                
  (27 358 000)                
  (28 108 000)                
  (64 436 000)                
  (66 331 000)                
  (68 428 000)                
  (70 380 000)                
  (75 413 000)                
  (77 663 000)                
  (80 446 000)                
  (82 339 400)                
  (337 632 350)                
  (346 117 850)                
Notes:
a Uncertainty of the listed value is unknown.

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