[skip navigation]
[ASD Home][Lines Query][Levels Query][List of Spectra][Ground States and Ionization Energies][Bibliography][Help] NIST Physical Measurement Laboratory
National Institute of Standards and Technology NIST Physical Measurement Laboratory
NIST Atomic Spectra Database
Ionization Energies Data

No (all spectra)
102 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) 
  53 444.0         
  (104 300)          
  [208 000]          
  [335 000]          
  (484 000)          
  (597 000)          
  (782 000)          
  (960 000)          
  (1 129 000)          
  (1 371 000)          
  (1 508 000)          
  (1 742 000)          
  (1 987 000)          
  (2 152 000)          
  (2 300 000)          
  (2 518 000)          
  (2 750 000)          
  (2 960 000)          
  (3 180 000)          
  (3 400 000)          
  (3 610 000)          
  (3 830 000)          
  (4 001 000)          
  (4 194 000)          
  (5 654 000)          
  (5 920 000)          
  (6 194 000)          
  (6 493 000)          
  (6 775 000)          
  (7 057 000)          
  (7 533 000)          
  (7 816 000)          
  (8 146 000)          
  (8 428 000)          
  (9 824 000)          
  (10 171 000)          
  (10 510 000)          
  (10 850 000)          
  (12 090 000)          
  (12 480 000)          
  (13 580 000)          
  (13 980 000)          
  (15 490 000)          
  (16 240 000)          
  (16 980 000)          
  (17 720 000)          
  (18 450 000)          
  (19 200 000)          
  (19 900 000)          
  (20 700 000)          
  (21 600 000)          
  (22 300 000)          
  (23 100 000)          
  (23 800 000)          
  (24 600 000)          
  (25 300 000)          
  (29 254 000)          
  (29 883 000)          
  (30 568 000)          
  (31 278 000)          
  (31 956 000)          
  (32 625 000)          
  (34 150 000)          
  (34 843 000)          
  (35 593 000)          
  (36 295 000)          
  (39 126 000)          
  (39 803 000)          
  (40 537 000)          
  (41 223 000)          
  (46 385 000)          
  (47 200 000)          
  (49 272 000)          
  (50 079 000)          
  (78 042 000)          
  (79 542 000)          
  (81 123 000)          
  (82 825 000)          
  (84 438 000)          
  (85 995 000)          
  (90 334 000)          
  (91 996 000)          
  (93 818 000)          
  (95 488 000)          
  (100 190 000)          
  (101 626 000)          
  (103 207 000)          
  (104 659 000)          
  (120 588 000)          
  (122 403 000)          
  (126 048 000)          
  (127 742 000)          
  (255 621 000)          
  (259 493 000)          
  (263 800 000)          
  (267 728 000)          
  (326 606 000)          
  (332 284 000)          
  (339 261 000)          
  (343 850 000)          
  (1 339 287 000)          
  (1 361 500 000)          
Notes:
a Uncertainty of the listed value is unknown.

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

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