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NIST Atomic Spectra Database
Ionization Energies Data

Ir (all spectra)
77 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) 
  72 323.9         
  [137 100]          
  (226 000)          
  (323 000)          
  (460 000)          
  (581 000)          
  (718 000)          
  (847 000)          
  [990 000]          
  [1 571 000]          
  (1 752 000)          
  (1 939 000)          
  (2 130 000)          
  (2 440 000)          
  (2 650 000)          
  (2 870 000)          
  (3 280 000)          
  (3 590 000)          
  (3 810 000)          
  (4 130 000)          
  (4 543 000)          
  (4 950 000)          
  (5 370 000)          
  (5 780 000)          
  (6 190 000)          
  (6 630 000)          
  (7 040 000)          
  (7 460 000)          
  (7 880 000)          
  (8 290 000)          
  (8 710 000)          
  (10 735 000)          
  (11 139 000)          
  (11 582 000)          
  (12 042 000)          
  (12 485 000)          
  (12 929 000)          
  (13 582 000)          
  (14 026 000)          
  (14 526 000)          
  (14 978 000)          
  (16 801 000)          
  (17 252 000)          
  (17 752 000)          
  (18 212 000)          
  (19 640 000)          
  (20 164 000)          
  (21 422 000)          
  [21 941 900]          
  (36 618 000)          
  (37 650 000)          
  (38 763 000)          
  (39 941 000)          
  (41 070 000)          
  (42 175 000)          
  (44 086 000)          
  (45 240 000)          
  (46 498 000)          
  (47 667 000)          
  (50 934 000)          
  (51 950 000)          
  (53 071 000)          
  (54 104 000)          
  (58 669 000)          
  (59 854 000)          
  (62 193 000)          
  (63 315 000)          
  (137 469 000)          
  (140 252 000)          
  (143 341 000)          
  (146 180 000)          
  (163 021 000)          
  (166 537 000)          
  (170 990 000)          
  (173 865 700)          
  (697 205 300)          
  (710 684 000)          
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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