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

Bk (all spectra)
97 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) 
  49 989          
  [96 000]         
  [174 000]         
  [290 000]         
  (452 000)         
  (565 000)         
  (726 000)         
  (922 000)         
  (1 049 000)         
  (1 187 000)         
  (1 378 000)         
  (1 570 000)         
  (1 761 000)         
  (1 937 000)         
  (2 090 000)         
  (2 250 000)         
  (2 440 000)         
  (2 734 000)         
  (2 912 000)         
  (4 009 000)         
  (4 242 000)         
  (4 493 000)         
  (4 759 000)         
  (5 009 000)         
  (5 259 000)         
  (5 646 000)         
  (5 912 000)         
  (6 194 000)         
  (6 452 000)         
  (7 753 000)         
  (8 065 000)         
  (8 380 000)         
  (8 687 000)         
  (9 660 000)         
  (10 010 000)         
  (10 980 000)         
  (11 340 000)         
  (12 500 000)         
  (13 180 000)         
  (13 860 000)         
  (14 543 000)         
  (15 220 000)         
  (15 900 000)         
  (16 570 000)         
  (17 250 000)         
  (18 070 000)         
  (18 750 000)         
  (19 450 000)         
  (20 100 000)         
  (20 800 000)         
  (21 500 000)         
  (24 842 000)         
  (25 439 000)         
  (26 068 000)         
  (26 737 000)         
  (27 366 000)         
  (27 979 000)         
  (29 278 000)         
  (29 915 000)         
  (30 625 000)         
  (31 270 000)         
  (33 891 000)         
  (34 529 000)         
  (35 206 000)         
  (35 851 000)         
  (39 868 000)         
  (40 618 000)         
  (42 505 000)         
  (43 256 000)         
  (68 525 000)         
  (69 928 000)         
  (71 412 000)         
  (73 017 000)         
  (74 526 000)         
  (75 985 000)         
  (79 688 000)         
  (81 236 000)         
  (82 938 000)         
  (84 519 000)         
  (88 906 000)         
  (90 262 000)         
  (91 746 000)         
  (93 117 000)         
  (105 586 000)         
  (107 264 000)         
  (110 627 000)         
  (112 184 000)         
  (228 876 000)         
  (232 530 000)         
  (236 579 000)         
  (240 289 000)         
  (286 440 000)         
  (291 586 000)         
  (298 038 000)         
  (302 116 000)         
  (1 184 965 000)         
  (1 204 980 000)         
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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