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

Ho (all spectra)
67 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) 
  48 567          
  [95 020]         
  [183 810]         
  [342 950]         
  [515 600]         
  (765 000)         
  (904 000)         
  (1 043 000)         
  (1 249 000)         
  (1 399 000)         
  (1 585 000)         
  (1 850 000)         
  (2 120 000)         
  (2 290 000)         
  (2 460 000)         
  (2 740 000)         
  (3 010 000)         
  (3 290 000)         
  (3 560 000)         
  (3 830 000)         
  (4 110 000)         
  (5 767 000)         
  (6 089 000)         
  (6 428 000)         
  (6 791 000)         
  (7 138 000)         
  (7 493 000)         
  (7 945 000)         
  (8 299 000)         
  (8 687 000)         
  (9 050 000)         
  (10 485 000)         
  (10 856 000)         
  (11 251 000)         
  (11 639 000)         
  (12 461 000)         
  (12 889 000)         
  (13 865 000)         
  [14 304 800]         
  (24 342 000)         
  (25 205 000)         
  (26 116 000)         
  (27 092 000)         
  (28 036 000)         
  (28 971 000)         
  (30 326 000)         
  (31 294 000)         
  (32 335 000)         
  (33 319 000)         
  (36 045 000)         
  (36 908 000)         
  (37 852 000)         
  (38 731 000)         
  (41 417 000)         
  (42 409 000)         
  (44 312 000)         
  (45 256 000)         
  (100 779 000)         
  (103 158 000)         
  (105 788 000)         
  (108 215 000)         
  (118 072 000)         
  (120 967 000)         
  (124 597 000)         
  (126 998 200)         
  (514 359 260)         
  (525 366 400)         
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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