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NIST Atomic Spectra Database
Ionization Energies Data

Se (all spectra)
34 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, March 28]. 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 
34  Selenium  Se  [Ar]3d104s24p4   3P2    9.752368                 0.000006   L21645 
34  Selenium  As  [Ar]3d104s24p3   43/2    21.196                    0.010      L17234c100 
34  Selenium  Ge  [Ar]3d104s24p2   3P0    31.697                    0.019      L17867 
34  Selenium  Ga  [Ar]3d104s24p   21/2    42.947                    0.003      L925 
34  Selenium  Zn  [Ar]3d104s2   1S0    [68.30]                    0.10       L16139 
34  Selenium  Cu  [Ar]3d104s   2S1/2    81.83                     0.03       L4300 
34  Selenium  Ni  [Ar]3d10   1S0    155.327                    0.012      L6168 
34  Selenium  Co  [Ar]3d9   2D5/2    (184.0)                     2.1        L8672c99 
34  Selenium  Fe  [Ar]3d8   3F4    (219.0)                     2.2        L8672c99 
34  Selenium  Mn  [Ar]3d7   4F9/2    (255.0)                     2.2        L8672c99 
34  Selenium  Cr  [Ar]3d6   5D4    (291.0)                     2.4        L8672c99 
34  Selenium  [Ar]3d5   6S5/2    (342.9)                     2.5        L8672c99 
34  Selenium  Ti  [Ar]3d4   5D0    (383)                       3          L8672c99 
34  Selenium  Sc  [Ar]3d3   4F3/2    (426)                       3          L8672c99 
34  Selenium  Ca  [Ar]3d2   3F2    (473)                       3          L8672c99 
34  Selenium  [Ar]3d   2D3/2    (517)                       3          L8672c99 
34  Selenium  Ar  [Ne]3s23p6   1S0    [650.5]                     2.1        L11770 
34  Selenium  Cl  [Ne]3s23p5   23/2    [693.4]                     0.7        L11770 
34  Selenium  [Ne]3s23p4   3P2    [739.8]                     1.1        L11770 
34  Selenium  [Ne]3s23p3   43/2    [798]                       3          L11770 
34  Selenium  Si  [Ne]3s23p2   3P0    [845.8]                     2.0        L11770 
34  Selenium  Al  [Ne]3s23p   21/2    [887]                       4          L11770 
34  Selenium  Mg  [Ne]3s2   1S0    [989.6]                     1.3        L11770 
34  Selenium  Na  [Ne]3s   2S1/2    [1 036.36]                    0.03       L11770 
34  Selenium  Ne  1s22s22p6   1S0    [2 540.7]                     1.4        L11770 
34  Selenium  1s22s22p5   23/2    [2 674]                       5          L11770 
34  Selenium  1s22s22p4   3P2    [2 820]                       6          L11770 
34  Selenium  1s22s22p3   43/2    [2 964]                       22          L11770 
34  Selenium  1s22s22p2   3P0    [3 146]                       3          L11770 
34  Selenium  1s22s22p   21/2    [3 301.8]                     2.1        L11770 
34  Selenium  Be  1s22s2   1S0    [3 507]                       3          L11770 
34  Selenium  Li  1s22s   2S1/2    (3 636.526)                   0.007      L16264c99 
34  Selenium  He  1s2   1S0    (15 367.493)                   0.003      L21139 
34  Selenium  1s   2S1/2    (15 968.1075)                  0.0012     L19200 
Notes:
Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6

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