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

Tc (all spectra)
43 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) 
  57 421.68         
  [123 100]           
  [238 300]           
  (331 000)           
  (460 000)           
  (581 000)           
  (710 000)           
  (1 210 000)           
  (1 363 000)           
  (1 532 000)           
  (1 726 000)           
  (1 928 000)           
  [2 113 800]           
  (2 508 000)           
  [2 730 600]           
  (4 872 000)           
  (5 283 000)           
  (5 751 000)           
  (6 235 000)           
  (6 686 000)           
  (7 291 000)           
  (7 807 000)           
  (8 324 000)           
  (8 888 000)           
  (9 404 000)           
  [10 919 000]           
  [11 385 600]           
  [11 933 100]           
  [12 576 000]           
  [13 212 800]           
  [13 622 000]           
  [14 821 800]           
  [15 326 790]           
  [36 335 000]           
  [37 756 000]           
  [39 309 000]           
  [40 796 000]           
  [43 242 000]           
  [44 926 000]           
  [47 089 000]           
  (48 460 940)           
  (201 675 145)           
  (207 986 560)           
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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