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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 (2018). NIST Atomic Spectra Database (ver. 5.6.1), [Online]. Available: https://physics.nist.gov/asd [2019, July 22]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 At. Num.   El.  name   Isoel.  Seq.   Ground  Shells a   Ground  Level   Ionization  Energy 
 (eV) 
Uncertainty
 (eV) 
 References 
20  Calcium  Ca  [Ar]4s2   1S0    6.1131554                 0.0000003   L8900 
20  Calcium  [Ar]4s   2S1/2    11.871719                  0.000004    L7185,L7323 
20  Calcium  Ar  [Ne]3s23p6   1S0    50.91316                   0.00025     L1405 
20  Calcium  Cl  [Ne]3s23p5   23/2    [67.2732]                   0.0021      L11770 
20  Calcium  [Ne]3s23p4   3P2    [84.34]                     0.08        L11770 
20  Calcium  [Ne]3s23p3   43/2    [108.78]                     0.25        L7185 
20  Calcium  Si  [Ne]3s23p2   3P0    [127.21]                     0.25        L7185 
20  Calcium  Al  [Ne]3s23p   21/2    147.24                      0.12        L7185 
20  Calcium  Mg  [Ne]3s2   1S0    [188.54]                     0.06        L7185 
20  Calcium  Na  [Ne]3s   2S1/2    [211.275]                    0.004       L11770 
20  Calcium  Ne  1s22s22p6   1S0    [591.60]                     0.12        L11770 
20  Calcium  1s22s22p5   23/2    [658.2]                      0.9         L11770 
20  Calcium  1s22s22p4   3P2    [728.6]                      1.1         L11770 
20  Calcium  1s22s22p3   43/2    [817.2]                      0.6         L11770 
20  Calcium  1s22s22p2   3P0    [894.0]                      0.4         L11770 
20  Calcium  1s22s22p   21/2    [973.7]                      0.3         L11770 
20  Calcium  Be  1s22s2   1S0    [1 086.8]                      0.4         L11770 
20  Calcium  Li  1s22s   2S1/2    (1 157.726)                    0.007       L16264c99 
20  Calcium  He  1s2   1S0    (5 128.8578)                   0.0005      L12128 
20  Calcium  1s   2S1/2    (5 469.8615)                   0.0010      L7188 
Notes:
Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6

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