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NIST Atomic Spectra Database
Ionization Energies Data

Ca (all spectra)
20 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) 
  49 305.919611         
  95 751.87             
  410 642.3              
  [542 595]               
  [680 230]               
  [877 400]               
  [1 026 000]               
  1 187 600                
  [1 520 640]               
  [1 704 049]               
  [4 771 550]               
  [5 309 100]               
  [5 876 800]               
  [6 591 300]               
  [7 210 400]               
  [7 853 400]               
  [8 766 000]               
  (9 337 690)               
  (41 367 026.6)             
  (44 117 425.0)             
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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