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

Es (all spectra)
99 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) 
  51 364.58         
  [98 000]           
  [183 000]           
  [313 000]           
  (436 000)           
  (573 000)           
  (782 000)           
  (911 000)           
  (1 105 000)           
  (1 264 000)           
  (1 453 000)           
  (1 665 000)           
  (1 863 000)           
  (2 030 000)           
  (2 180 000)           
  (2 370 000)           
  (2 560 000)           
  (2 760 000)           
  (2 960 000)           
  (3 210 000)           
  (3 396 000)           
  (4 646 000)           
  (4 888 000)           
  (5 146 000)           
  (5 420 000)           
  (5 686 000)           
  (5 952 000)           
  (6 372 000)           
  (6 646 000)           
  (6 944 000)           
  (7 219 000)           
  (8 533 000)           
  (8 856 000)           
  (9 180 000)           
  (9 500 000)           
  (10 570 000)           
  (10 940 000)           
  (11 960 000)           
  (12 340 000)           
  (13 650 000)           
  (14 350 000)           
  (15 050 000)           
  (15 752 000)           
  (16 450 000)           
  (17 160 000)           
  (17 870 000)           
  (18 570 000)           
  (19 410 000)           
  (20 100 000)           
  (20 800 000)           
  (21 600 000)           
  (22 300 000)           
  (23 000 000)           
  (26 568 000)           
  (27 181 000)           
  (27 818 000)           
  (28 512 000)           
  (29 165 000)           
  (29 794 000)           
  (31 181 000)           
  (31 835 000)           
  (32 569 000)           
  (33 230 000)           
  (35 940 000)           
  (36 593 000)           
  (37 295 000)           
  (37 948 000)           
  (42 393 000)           
  (43 167 000)           
  (45 135 000)           
  (45 901 000)           
  (72 259 000)           
  (73 695 000)           
  (75 227 000)           
  (76 865 000)           
  (78 413 000)           
  (79 913 000)           
  (83 866 000)           
  (85 446 000)           
  (87 213 000)           
  (88 818 000)           
  (93 326 000)           
  (94 722 000)           
  (96 246 000)           
  (97 641 000)           
  (111 401 000)           
  (113 135 000)           
  (116 604 000)           
  (118 217 000)           
  (239 385 000)           
  (243 120 000)           
  (247 282 000)           
  (251 064 000)           
  (301 958 000)           
  (307 305 000)           
  (313 976 000)           
  (318 197 000)           
  (1 244 868 000)           
  (1 265 700 000)           
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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