[skip navigation]
[ASD Home][Lines Query][Levels Query][List of Spectra][Ground States and Ionization Energies][Bibliography][Help] NIST Physical Measurement Laboratory
National Institute of Standards and Technology NIST Physical Measurement Laboratory
NIST Atomic Spectra Database
Ionization Energies Data

Pa (all spectra)
91 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) 
  [47 500]         
  [96 000]         
  [150 000]         
  [249 000]         
  (357 000)         
  (581 000)         
  (686 000)         
  (798 000)         
  (895 000)         
  (1 105 000)         
  (1 234 000)         
  (1 508 000)         
  (1 637 000)         
  (2 355 000)         
  (2 549 000)         
  (2 758 000)         
  (2 976 000)         
  (3 186 000)         
  (3 412 000)         
  (3 710 000)         
  (3 936 000)         
  (4 178 000)         
  (4 404 000)         
  (5 551 000)         
  (5 829 000)         
  (6 106 000)         
  (6 380 000)         
  (7 080 000)         
  (7 390 000)         
  (8 210 000)         
  (8 530 000)         
  (9 270 000)         
  (9 870 000)         
  (10 470 000)         
  (11 074 000)         
  (11 680 000)         
  (12 280 000)         
  (12 880 000)         
  (13 490 000)         
  (14 170 000)         
  (14 780 000)         
  (15 400 000)         
  (16 000 000)         
  (16 600 000)         
  (17 200 000)         
  (20 027 000)         
  (20 567 000)         
  (21 132 000)         
  (21 745 000)         
  (22 309 000)         
  (22 882 000)         
  (23 939 000)         
  (24 519 000)         
  (25 156 000)         
  (25 753 000)         
  (28 133 000)         
  (28 697 000)         
  (29 334 000)         
  (29 915 000)         
  (32 883 000)         
  (33 561 000)         
  (35 246 000)         
  [35 923 800]         
  (57 919 000)         
  (59 209 000)         
  (60 588 000)         
  (62 048 000)         
  (63 452 000)         
  (64 807 000)         
  (67 847 000)         
  (69 267 000)         
  (70 840 000)         
  (72 291 000)         
  (76 340 000)         
  (77 582 000)         
  (78 954 000)         
  (80 228 000)         
  (89 495 000)         
  (91 020 000)         
  (94 044 000)         
  (95 464 000)         
  (198 880 000)         
  (202 252 000)         
  (206 010 000)         
  (209 446 000)         
  (243 813 000)         
  (248 387 000)         
  (254 194 000)         
  (257 868 000)         
  (1 018 716 600)         
  (1 036 480 000)         
Notes:
a Uncertainty of the listed value is unknown.

If you did not find the data you need, please inform the ASD Team.

[ASD Home][Lines Query][Levels Query][List of Spectra][Ground States and Ionization Energies][Bibliography][Help] NIST Physical Measurement Laboratory