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NIST Atomic Spectra Database
Ionization Energies Data

Pm (all spectra)
61 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) 
  45 020.8         
  [88 220]          
  [181 000]          
  [332 060]          
  [497 600]          
  (688 000)          
  (814 000)          
  (939 000)          
  (1 116 000)          
  (1 250 000)          
  (1 403 000)          
  (1 628 000)          
  (1 850 000)          
  (2 000 000)          
  (2 170 000)          
  (3 468 000)          
  (3 726 000)          
  (4 009 000)          
  (4 307 000)          
  (4 589 000)          
  (4 912 000)          
  (5 251 000)          
  (5 557 000)          
  (5 888 000)          
  (6 186 000)          
  (7 388 000)          
  (7 711 000)          
  (8 049 000)          
  (8 388 000)          
  (8 977 000)          
  (9 340 000)          
  (10 171 000)          
  [10 555 400]          
  (18 156 000)          
  (18 906 000)          
  (19 704 000)          
  (20 559 000)          
  (21 390 000)          
  (22 221 000)          
  (23 326 000)          
  (24 172 000)          
  (25 100 000)          
  (25 963 000)          
  (28 383 000)          
  (29 141 000)          
  (29 988 000)          
  (30 778 000)          
  (32 714 000)          
  (33 601 000)          
  (35 254 000)          
  (36 101 000)          
  (81 583 000)          
  (83 704 000)          
  (86 067 000)          
  (88 253 000)          
  (95 327 000)          
  (97 883 000)          
  (101 077 000)          
  (103 216 900)          
  (420 572 060)          
  (430 267 000)          
Notes:
a Uncertainty of the listed value is unknown.

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