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

Am (all spectra)
95 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) 
  48 182          
  [94 000]         
  [175 000]         
  [297 000]         
  (403 000)         
  (548 000)         
  (769 000)         
  (890 000)         
  (1 012 000)         
  (1 134 000)         
  (1 311 000)         
  (1 488 000)         
  (1 665 000)         
  (1 815 000)         
  (1 952 000)         
  (2 291 000)         
  (2 460 000)         
  (3 420 000)         
  (3 638 000)         
  (3 880 000)         
  (4 121 000)         
  (4 363 000)         
  (4 605 000)         
  (4 968 000)         
  (5 210 000)         
  (5 485 000)         
  (5 735 000)         
  (6 977 000)         
  (7 278 000)         
  (7 580 000)         
  (7 880 000)         
  (8 760 000)         
  (9 090 000)         
  (10 010 000)         
  (10 360 000)         
  (11 370 000)         
  (12 030 000)         
  (12 680 000)         
  (13 333 000)         
  (13 990 000)         
  (14 640 000)         
  (15 290 000)         
  (15 950 000)         
  (16 720 000)         
  (17 390 000)         
  (18 050 000)         
  (18 700 000)         
  (19 400 000)         
  (20 000 000)         
  (23 180 000)         
  (23 761 000)         
  (24 366 000)         
  (25 011 000)         
  (25 632 000)         
  (26 221 000)         
  (27 439 000)         
  (28 060 000)         
  (28 738 000)         
  (29 367 000)         
  (31 907 000)         
  (32 528 000)         
  (33 190 000)         
  (33 803 000)         
  (37 440 000)         
  (38 174 000)         
  (39 989 000)         
  (40 707 000)         
  (64 887 000)         
  (66 258 000)         
  (67 710 000)         
  (69 259 000)         
  (70 735 000)         
  (72 162 000)         
  (75 623 000)         
  (77 139 000)         
  (78 792 000)         
  (80 325 000)         
  (84 599 000)         
  (85 922 000)         
  (87 374 000)         
  (88 697 000)         
  (100 013 000)         
  (101 626 000)         
  (104 876 000)         
  (106 385 000)         
  (218 633 000)         
  (222 182 000)         
  (226 142 000)         
  (229 755 000)         
  (271 607 000)         
  (276 543 000)         
  (282 794 000)         
  (286 725 000)         
  (1 127 317 400)         
  (1 146 545 000)         
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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