NIST Atomic Ionization Energies Output

NIST Physical Measurement Laboratory

NIST Atomic Spectra Database Ionization Energies Data Bh (all spectra) 96 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 ^a (cm^-1)
[62 000]
[141 000]
[215 000]
[301 000]
[395 000]
[501 000]
[604 000]
(1 081 000)
(1 194 000)
(1 436 000)
(1 597 000)
(1 839 000)
(2 057 000)
(2 266 000)
(2 565 000)
(2 718 000)
(3 017 000)

(7 533 000)
(7 816 000)
(8 130 000)
(8 461 000)
(8 775 000)
(9 082 000)
(9 654 000)
(9 977 000)
(10 324 000)
(10 647 000)






















(34 004 000)
(34 690 000)
(35 408 000)
(36 182 000)
(36 908 000)
(37 618 000)
(39 408 000)
(40 150 000)
(40 957 000)
(41 715 000)
(44 756 000)
(45 482 000)
(46 264 000)
(46 990 000)
(53 628 000)
(54 499 000)
(56 757 000)
(57 620 000)
(88 189 000)
(89 770 000)
(91 455 000)
(93 262 000)
(94 972 000)
(96 617 000)
(101 723 000)
(103 481 000)
(105 425 000)
(107 207 000)
(112 208 000)
(113 732 000)
(115 410 000)
(116 958 000)
(137 259 000)
(139 244 000)
(143 163 000)
(144 994 000)
(283 964 000)
(288 069 000)
(292 634 000)
(296 796 000)
(371 814 000)
(378 105 000)
(385 541 000)

(1 510 352 000)
(1 535 110 000)

Notes:
^aIf the listed ionization energy is blank, it is unknown. Only the ground state is known.
^bUncertainty of the listed value is unknown.

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

NIST Physical Measurement Laboratory