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NIST Atomic Spectra Database
Ionization Energies Data

Cf (all spectra)
98 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) 
  50 666.76         
  [97 000]           
  [181 000]           
  [304 000]           
  (419 000)           
  (605 000)           
  (734 000)           
  (911 000)           
  (1 073 000)           
  (1 228 000)           
  (1 433 000)           
  (1 625 000)           
  (1 816 000)           
  (1 991 000)           
  (2 140 000)           
  (2 310 000)           
  (2 500 000)           
  (2 690 000)           
  (2 968 000)           
  (3 146 000)           
  (4 323 000)           
  (4 565 000)           
  (4 815 000)           
  (5 081 000)           
  (5 339 000)           
  (5 606 000)           
  (6 001 000)           
  (6 275 000)           
  (6 565 000)           
  (6 832 000)           
  (8 122 000)           
  (8 445 000)           
  (8 759 000)           
  (9 070 000)           
  (10 090 000)           
  (10 450 000)           
  (11 450 000)           
  (11 820 000)           
  (13 050 000)           
  (13 740 000)           
  (14 430 000)           
  (15 123 000)           
  (15 820 000)           
  (16 500 000)           
  (17 200 000)           
  (17 880 000)           
  (18 720 000)           
  (19 420 000)           
  (20 100 000)           
  (20 800 000)           
  (21 500 000)           
  (22 200 000)           
  (25 697 000)           
  (26 302 000)           
  (26 939 000)           
  (27 616 000)           
  (28 254 000)           
  (28 883 000)           
  (30 222 000)           
  (30 875 000)           
  (31 577 000)           
  (32 246 000)           
  (34 916 000)           
  (35 545 000)           
  (36 247 000)           
  (36 892 000)           
  (41 118 000)           
  (41 876 000)           
  (43 812 000)           
  (44 562 000)           
  (70 380 000)           
  (71 799 000)           
  (73 308 000)           
  (74 921 000)           
  (76 461 000)           
  (77 937 000)           
  (81 760 000)           
  (83 333 000)           
  (85 059 000)           
  (86 648 000)           
  (91 108 000)           
  (92 480 000)           
  (93 972 000)           
  (95 367 000)           
  (108 465 000)           
  (110 167 000)           
  (113 587 000)           
  (115 168 000)           
  (234 102 000)           
  (237 788 000)           
  (241 902 000)           
  (245 644 000)           
  (294 110 000)           
  (299 361 000)           
  (305 918 000)           
  (310 068 000)           
  (1 214 611 000)           
  (1 235 030 000)           
Notes:
a Uncertainty of the listed value is unknown.

If you did not find the data you need, please inform the ASD Team.

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