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NIST Atomic Spectra Database
Ionization Energies Data

Hf (all spectra)
72 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) 
  55 047.9         
  (117 820)          
  (181 840)          
  [269 150]          
  [551 480]          
  (792 000)          
  (951 000)          
  (1 109 000)          
  (1 267 000)          
  (1 511 000)          
  (1 685 000)          
  (1 855 000)          
  (2 180 000)          
  (2 500 000)          
  (2 690 000)          
  (2 892 000)          
  (3 220 000)          
  (3 550 000)          
  (3 880 000)          
  (4 210 000)          
  (4 560 000)          
  (4 890 000)          
  (5 230 000)          
  (5 560 000)          
  (5 890 000)          
  (6 230 000)          
  (8 082 000)          
  (8 445 000)          
  (8 824 000)          
  (9 243 000)          
  (9 638 000)          
  (10 042 000)          
  (10 574 000)          
  (10 985 000)          
  (11 429 000)          
  (11 832 000)          
  (13 461 000)          
  (13 865 000)          
  (14 324 000)          
  (14 736 000)          
  (15 833 000)          
  (16 309 000)          
  (17 414 000)          
  [17 896 900]          
  (30 173 000)          
  (31 117 000)          
  (32 133 000)          
  (33 214 000)          
  (34 246 000)          
  (35 263 000)          
  (36 884 000)          
  (37 932 000)          
  (39 086 000)          
  (40 166 000)          
  (43 151 000)          
  (44 102 000)          
  (45 127 000)          
  (46 078 000)          
  (49 595 000)          
  (50 684 000)          
  (52 789 000)          
  (53 829 000)          
  (118 386 000)          
  (120 975 000)          
  (123 814 000)          
  (126 460 000)          
  (139 381 000)          
  (142 575 000)          
  (146 599 000)          
  (149 231 300)          
  (601 414 600)          
  (613 608 000)          
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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