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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 (2023). NIST Atomic Spectra Database (ver. 5.11), [Online]. Available: https://physics.nist.gov/asd [2024, April 26]. 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    6.11315547                 0.00000025   L8900 
20  Calcium  K  [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   2P°3/2    [67.2732]                    0.0021       L11770 
20  Calcium  S  [Ne]3s23p4   3P2    [84.34]                      0.08         L11770 
20  Calcium  P  [Ne]3s23p3   4S°3/2    [108.78]                      0.25         L7185 
20  Calcium  Si  [Ne]3s23p2   3P0    [127.21]                      0.25         L7185 
20  Calcium  Al  [Ne]3s23p   2P°1/2    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  F  1s22s22p5   2P°3/2    [658.2]                       0.9          L11770 
20  Calcium  O  1s22s22p4   3P2    [728.6]                       1.1          L11770 
20  Calcium  N  1s22s22p3   4S°3/2    [817.2]                       0.6          L11770 
20  Calcium  C  1s22s22p2   3P0    [894.0]                       0.4          L11770 
20  Calcium  B  1s22s22p   2P°1/2    [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    (5 128.8576)                    0.0003       L21139 
20  Calcium  H  1s   2S1/2    (5 469.86358)                   0.00006      L19200 
Notes:
a Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6

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