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NIST Atomic Spectra Database
Ionization Energies Data

Os (all spectra)
76 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) 
  68 058.9         
  [137 000]          
  (202 000)          
  (331 000)          
  (444 000)          
  (565 000)          
  (686 000)          
  [822 880]          
  [1 361 000]          
  (1 534 000)          
  (1 716 000)          
  (1 897 000)          
  (2 170 000)          
  (2 400 000)          
  (2 600 000)          
  (2 960 000)          
  (3 310 000)          
  (3 520 000)          
  (3 790 000)          
  (4 185 000)          
  (4 580 000)          
  (4 980 000)          
  (5 370 000)          
  (5 770 000)          
  (6 190 000)          
  (6 590 000)          
  (6 990 000)          
  (7 400 000)          
  (7 800 000)          
  (8 190 000)          
  (10 179 000)          
  (10 574 000)          
  (11 001 000)          
  (11 453 000)          
  (11 889 000)          
  (12 324 000)          
  (12 953 000)          
  (13 389 000)          
  (13 873 000)          
  (14 324 000)          
  (16 099 000)          
  (16 550 000)          
  (17 034 000)          
  (17 486 000)          
  (18 841 000)          
  (19 357 000)          
  (20 583 000)          
  [21 095 200]          
  (35 279 000)          
  (36 303 000)          
  (37 384 000)          
  (38 545 000)          
  (39 658 000)          
  (40 747 000)          
  (42 586 000)          
  (43 723 000)          
  (44 965 000)          
  (46 111 000)          
  (49 321 000)          
  (50 329 000)          
  (51 426 000)          
  (52 450 000)          
  (56 773 000)          
  (57 951 000)          
  (60 233 000)          
  (61 347 000)          
  (133 533 000)          
  (136 275 000)          
  (139 316 000)          
  (142 115 000)          
  (158 093 000)          
  (161 553 000)          
  (165 908 000)          
  (168 736 000)          
  (677 313 600)          
  (690 526 900)          
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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