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NIST Atomic Spectra Database
Ionization Energies Data

As (all spectra)
33 Data Rows Found 
Example of how to reference these results:
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2022). NIST Atomic Spectra Database (ver. 5.10), [Online]. Available: https://physics.nist.gov/asd [2023, June 1]. 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 
33  Arsenic  As  [Ar]3d104s24p3   4S°3/2    9.78855                 0.00025   L1351 
33  Arsenic  Ge  [Ar]3d104s24p2   3P0    18.5892                  0.0010    L820 
33  Arsenic  Ga  [Ar]3d104s24p   2P°1/2    28.349                   0.012     L9358 
33  Arsenic  Zn  [Ar]3d104s2   1S0    50.15                    0.06      L9358 
33  Arsenic  Cu  [Ar]3d104s   2S1/2    62.77                    0.06      L5339 
33  Arsenic  Ni  [Ar]3d10   1S0    121.19                    0.06      L11275 
33  Arsenic  Co  [Ar]3d9   2D5/2    (147.0)                    2.0       L8672c99 
33  Arsenic  Fe  [Ar]3d8   3F4    (180.0)                    2.1       L8672c99 
33  Arsenic  Mn  [Ar]3d7   4F9/2    (213.0)                    2.2       L8672c99 
33  Arsenic  Cr  [Ar]3d6   5D4    (247.0)                    2.2       L8672c99 
33  Arsenic  V  [Ar]3d5   6S5/2    (296.0)                    2.4       L8672c99 
33  Arsenic  Ti  [Ar]3d4   5D0    (333.0)                    2.5       L8672c99 
33  Arsenic  Sc  [Ar]3d3   4F3/2    (375)                      3         L8672c99 
33  Arsenic  Ca  [Ar]3d2   3F2    (418)                      3         L8672c99 
33  Arsenic  K  [Ar]3d   2D3/2    (460)                      3         L8672c99 
33  Arsenic  Ar  [Ne]3s23p6   1S0    [587.6]                    1.9       L11770 
33  Arsenic  Cl  [Ne]3s23p5   2P°3/2    [628.8]                    0.6       L11770 
33  Arsenic  S  [Ne]3s23p4   3P2    [672.9]                    0.9       L11770 
33  Arsenic  P  [Ne]3s23p3   4S°3/2    [728.9]                    2.2       L11770 
33  Arsenic  Si  [Ne]3s23p2   3P0    [774.0]                    1.8       L11770 
33  Arsenic  Al  [Ne]3s23p   2P°1/2    [814]                      4         L11770 
33  Arsenic  Mg  [Ne]3s2   1S0    [911.7]                    1.1       L11770 
33  Arsenic  Na  [Ne]3s   2S1/2    [956.79]                   0.03      L11770 
33  Arsenic  Ne  1s22s22p6   1S0    [2 356.9]                    1.4       L11770 
33  Arsenic  F  1s22s22p5   2P°3/2    [2 486]                      4         L11770 
33  Arsenic  O  1s22s22p4   3P2    [2 626]                      6         L11770 
33  Arsenic  N  1s22s22p3   4S°3/2    [2 766]                      21         L11770 
33  Arsenic  C  1s22s22p2   3P0    [2 938]                      3         L11770 
33  Arsenic  B  1s22s22p   2P°1/2    [3 088.1]                    1.9       L11770 
33  Arsenic  Be  1s22s2   1S0    [3 287]                      3         L11770 
33  Arsenic  Li  1s22s   2S1/2    (3 411.643)                  0.007     L16264c99 
33  Arsenic  He  1s2   1S0    (14 447.678)                  0.003     L12128 
33  Arsenic  H  1s   2S1/2    (15 028.9251)                 0.0010    L19200 
Notes:
a Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6

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