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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 (2021). NIST Atomic Spectra Database (ver. 5.9), [Online]. Available: https://physics.nist.gov/asd [2021, November 30]. 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  Calcium    6.11315547                 0.00000025   L8900 
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    (5 128.8578)                    0.0005       L12128 
20  +19  Calcium    (5 469.8616)                    0.0010       L7188 

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