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

Pr (all spectra)
59 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) 
  [44 120]         
  [85 745]         
  174 407          
  [314 400]         
  [464 000]         
  (663 000)         
  (784 000)         
  (905 000)         
  (1 056 000)         
  (1 195 000)         
  (1 307 000)         
  (1 581 000)         
  [1 750 400]         
  (2 823 000)         
  (3 049 000)         
  (3 323 000)         
  (3 589 000)         
  (3 855 000)         
  (4 162 000)         
  (4 468 000)         
  (4 759 000)         
  (5 057 000)         
  (5 347 000)         
  (6 477 000)         
  (6 775 000)         
  (7 098 000)         
  (7 420 000)         
  (7 945 000)         
  (8 291 000)         
  (9 066 000)         
  [9 436 200]         
  (16 284 000)         
  (17 002 000)         
  (17 760 000)         
  (18 583 000)         
  (19 357 000)         
  (20 172 000)         
  (21 196 000)         
  (22 011 000)         
  (22 890 000)         
  (23 721 000)         
  (26 028 000)         
  (26 770 000)         
  (27 576 000)         
  (28 326 000)         
  (30 076 000)         
  (30 907 000)         
  (32 504 000)         
  (33 311 000)         
  (75 639 000)         
  (77 687 000)         
  (79 954 000)         
  (82 067 000)         
  (88 390 000)         
  (90 834 000)         
  (93 891 000)         
  (95 946 800)         
  (391 757 280)         
  (401 038 500)         
Notes:
a Uncertainty of the listed value is unknown.

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