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

Cu (all spectra)
29 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) 
  62 317.46         
  163 669.2          
  297 140            
  [462 800]           
  [644 000]           
  [831 000]           
  [1 121 000]           
  (1 339 000)           
  (1 597 000)           
  [1 873 000]           
  2 140 000            
  [2 960 300]           
  [3 234 100]           
  [3 516 900]           
  [3 896 700]           
  [4 183 600]           
  [4 458 300]           
  [5 101 300]           
  [5 408 820]           
  [13 635 000]           
  [14 518 000]           
  [15 472 000]           
  [16 484 000]           
  [17 578 300]           
  [18 610 000]           
  [19 995 200]           
  (20 865 190)           
  (89 224 522.5)         
  (93 299 177)           
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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