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

Ra (all spectra)
88 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) 
  42 573.36         
  81 842.5          
  (250 000)           
  (331 000)           
  (427 000)           
  (516 000)           
  (661 000)           
  (782 000)           
  (1 000 000)           
  (1 129 000)           
  (1 653 000)           
  (1 831 000)           
  (2 016 000)           
  (2 210 000)           
  (2 412 000)           
  (2 613 000)           
  (2 871 000)           
  (3 081 000)           
  (3 299 000)           
  (3 509 000)           
  (4 577 000)           
  (4 835 000)           
  (5 090 000)           
  (5 350 000)           
  (5 930 000)           
  (6 220 000)           
  (6 970 000)           
  (7 270 000)           
  (7 800 000)           
  (8 360 000)           
  (8 930 000)           
  (9 485 000)           
  (10 050 000)           
  (10 610 000)           
  (11 180 000)           
  (11 740 000)           
  (12 370 000)           
  (12 950 000)           
  (13 520 000)           
  (14 100 000)           
  (14 700 000)           
  (15 200 000)           
  (17 809 000)           
  (18 317 000)           
  (18 857 000)           
  (19 430 000)           
  (19 978 000)           
  (20 519 000)           
  (21 470 000)           
  (22 027 000)           
  (22 632 000)           
  (23 197 000)           
  (25 447 000)           
  (26 003 000)           
  (26 600 000)           
  (27 165 000)           
  (29 697 000)           
  (30 343 000)           
  (31 931 000)           
  [32 584 200]           
  (52 950 000)           
  (54 184 000)           
  (55 499 000)           
  (56 910 000)           
  (58 249 000)           
  (59 548 000)           
  (62 298 000)           
  (63 669 000)           
  (65 170 000)           
  (66 557 000)           
  (70 436 000)           
  (71 630 000)           
  (72 945 000)           
  (74 171 000)           
  (82 148 000)           
  (83 599 000)           
  (86 463 000)           
  (87 818 000)           
  (184 717 000)           
  (187 959 000)           
  (191 565 000)           
  (194 880 000)           
  (224 464 000)           
  (228 787 000)           
  (234 288 000)           
  (237 771 000)           
  (942 486 800)           
  (959 231 000)           
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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