NIST Atomic Ionization Energies Output

NIST Physical Measurement Laboratory

NIST Atomic Spectra Database Ionization Energies Data Tb (all spectra) 65 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)
47 295
[92 860]
[175 990]
[317 200]
[536 000]
(729 000)
(868 000)
(1 007 000)
(1 157 000)
(1 353 000)
(1 501 000)
(1 745 000)
(2 020 000)
(2 200 000)
(2 370 000)
(2 620 000)
(2 890 000)
(3 170 000)
(3 441 000)
(4 944 000)
(5 251 000)
(5 565 000)
(5 904 000)
(6 227 000)
(6 581 000)
(6 985 000)
(7 332 000)
(7 695 000)
(8 041 000)
(9 396 000)
(9 743 000)
(10 130 000)
(10 493 000)
(11 235 000)
(11 639 000)
(12 574 000)
[12 988 600]
(22 180 000)
(23 003 000)
(23 882 000)
(24 826 000)
(25 721 000)
(26 616 000)
(27 891 000)
(28 818 000)
(29 826 000)
(30 762 000)
(33 383 000)
(34 214 000)
(35 125 000)
(35 972 000)
(38 392 000)
(39 336 000)
(41 158 000)
(42 078 000)
(94 149 000)
(96 440 000)
(98 980 000)
(101 327 000)
(110 159 000)
(112 942 000)
(116 418 000)
(118 733 000)
(481 844 590)
(492 402 000)

Notes:
^aUncertainty of the listed value is unknown.

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

NIST Physical Measurement Laboratory