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

Hs (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 a 
 (cm-1) 
  [61 000]         
  [147 000]         
  [236 000]         
  [304 000]         
  [413 000]         
  [516 000]         
  [630 000]         
  [740 000]         
  (1 290 000)         
  (1 403 000)         
  (1 662 000)         
  (1 831 000)         
  (2 081 000)         
  (2 299 000)         
  (2 533 000)         
  (2 831 000)         
  (2 992 000)         
  (3 299 000)         
  
  (7 936 000)         
  (8 227 000)         
  (8 549 000)         
  (8 880 000)         
  (9 195 000)         
  (9 517 000)         
  (10 106 000)         
  (10 437 000)         
  (10 792 000)         
  (11 122 000)         
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  (34 996 000)         
  (35 690 000)         
  (36 424 000)         
  (37 198 000)         
  (37 940 000)         
  (38 658 000)         
  (40 513 000)         
  (41 255 000)         
  (42 086 000)         
  (42 836 000)         
  (45 941 000)         
  (46 659 000)         
  (47 458 000)         
  (48 192 000)         
  (55 168 000)         
  (56 056 000)         
  (58 346 000)         
  (59 225 000)         
  (90 294 000)         
  (91 891 000)         
  (93 601 000)         
  (95 423 000)         
  (97 149 000)         
  (98 819 000)         
  (104 086 000)         
  (105 868 000)         
  (107 828 000)         
  (109 643 000)         
  (114 700 000)         
  (116 249 000)         
  (117 942 000)         
  (119 499 000)         
  (140 832 000)         
  (142 841 000)         
  (146 809 000)         
  (148 664 000)         
  (289 835 000)         
  (293 973 000)         
  (298 603 000)         
  (302 805 000)         
  (381 549 000)         
  (387 985 000)         
  (395 478 000)         
  
  (1 546 840 000)         
  (1 572 060 000)         
Notes:
a If the listed ionization energy is blank, it is unknown. Only the ground state is known.
b Uncertainty of the listed value is unknown.

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