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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, March 8]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 At. Num.   Ion  Charge   El.  name   Ionization  Energy 
 (eV) 		 Uncertainty
 (eV) 		  References 
20  0  Calcium    6.1131549210                 0.0000000005   L22848 
20  +1  Calcium    11.871719                     0.000004       L7185,L7323 
20  +2  Calcium    50.91316                      0.00025        L1405 
20  +3  Calcium    [67.2732]                      0.0021         L11770 
20  +4  Calcium    [84.34]                        0.08           L11770 
20  +5  Calcium    [108.78]                        0.25           L7185 
20  +6  Calcium    [127.21]                        0.25           L7185 
20  +7  Calcium    147.24                         0.12           L7185 
20  +8  Calcium    [188.54]                        0.06           L7185 
20  +9  Calcium    [211.275]                       0.004          L11770 
20  +10  Calcium    [591.60]                        0.12           L11770 
20  +11  Calcium    [658.2]                         0.9            L11770 
20  +12  Calcium    [728.6]                         1.1            L11770 
20  +13  Calcium    [817.2]                         0.6            L11770 
20  +14  Calcium    [894.0]                         0.4            L11770 
20  +15  Calcium    [973.7]                         0.3            L11770 
20  +16  Calcium    [1 086.8]                         0.4            L11770 
20  +17  Calcium    (1 157.726)                       0.007          L16264c99 
20  +18  Calcium    (5 128.8576)                      0.0003         L21139 
20  +19  Calcium    (5 469.86358)                     0.00006        L19200 

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