NIST Atomic Ionization Energies Output

NIST Physical Measurement Laboratory

NIST Atomic Spectra Database Ionization Energies Data Gd (all spectra) 64 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)
49 601.45
[97 400]
[165 670]
[358 400]
[522 300]
(717 000)
(853 000)
(990 000)
(1 160 000)
(1 330 000)
(1 475 000)
(1 716 000)
(1 981 000)
(2 160 000)
(2 320 000)
(2 570 000)
(2 840 000)
(3 100 000)
(4 557 000)
(4 847 000)
(5 154 000)
(5 485 000)
(5 799 000)
(6 138 000)
(6 533 000)
(6 864 000)
(7 219 000)
(7 557 000)
(8 872 000)
(9 211 000)
(9 590 000)
(9 945 000)
(10 655 000)
(11 034 000)
(11 945 000)
[12 359 200]
(21 140 000)
(21 938 000)
(22 801 000)
(23 721 000)
(24 600 000)
(25 487 000)
(26 713 000)
(27 616 000)
(28 600 000)
(29 520 000)
(32 101 000)
(32 907 000)
(33 803 000)
(34 633 000)
(36 924 000)
(37 852 000)
(39 634 000)
(40 529 000)
(90 923 000)
(93 173 000)
(95 665 000)
(97 972 000)
(106 328 000)
(109 054 000)
(112 458 000)
(114 728 900)
(466 058 690)
(476 395 700)

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