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NIST Atomic Spectra Database
Ionization Energies Data

Ba (all spectra)
56 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 
56  Barium  Ba  [Xe]6s2   1S0    5.2116646                 0.0000012   L6347,L9224 
56  Barium  Cs  [Xe]6s   2S1/2    10.003826                  0.000012    L9224 
56  Barium  Xe  [Cd]5p6   1S0    35.8438                    0.0025      L3667 
56  Barium  [Cd]5p5   23/2    [47.0]                      0.3         L11023 
56  Barium  Te  [Cd]5p4   3P2    (58.0)                      1.9         L8672c99 
56  Barium  Sb  [Cd]5p3   43/2    (71.0)                      2.0         L8672c99 
56  Barium  Sn  [Cd]5p2   3P0    (86.0)                      2.0         L8672c99 
56  Barium  In  [Cd]5p   21/2    (101.0)                      2.1         L8672c99 
56  Barium  Cd  [Kr]4d105s2   1S0    [130.5]                      0.6         L6980 
56  Barium  Ag  [Kr]4d105s   2S1/2    [146.52]                     0.12        L5438 
56  Barium  Pd  [Kr]4d10   1S0    (241.0)                      2.4         L8672c99 
56  Barium  Rh  [Kr]4d9   2D5/2    (267.1)                      2.5         L8672c99 
56  Barium  Ru  [Kr]4d8   3F4    (296)                        3           L8672c99 
56  Barium  Tc  [Kr]4d7   4F9/2    (325)                        3           L8672c99 
56  Barium  Mo  [Kr]4d6   5D4    (354)                        3           L8672c99 
56  Barium  Nb  [Kr]4d5   6S5/2    (390)                        3           L8672c99 
56  Barium  Zr  [Kr]4d4   5D0    (422)                        3           L8672c99 
56  Barium  [Kr]4d3   4F3/2    (455)                        3           L8672c99 
56  Barium  Sr  [Kr]4d2   3F2    (488)                        3           L8672c99 
56  Barium  Rb  [Kr]4d   2D3/2    (520)                        4           L8672c99 
56  Barium  Kr  [Ar]3d104s24p6   1S0    (646)                        4           L8672c99 
56  Barium  Br  [Ar]3d104s24p5   23/2    (679)                        4           L8672c99 
56  Barium  Se  [Ar]3d104s24p4   3P2    (717)                        4           L8672c99 
56  Barium  As  [Ar]3d104s24p3   43/2    (752)                        4           L8672c99 
56  Barium  Ge  [Ar]3d104s24p2   3P0    (809)                        4           L8672c99 
56  Barium  Ga  [Ar]3d104s24p   21/2    (846)                        4           L8672c99 
56  Barium  Zn  [Ar]3d104s2   1S0    (935)                        4           L8672c99 
56  Barium  Cu  [Ar]3d104s   2S1/2    [976.62]                     0.11        L5473 
56  Barium  Ni  [Ar]3d10   1S0    (1 695)                        4           L8672c99 
56  Barium  Co  [Ar]3d9   2D5/2    (1 776)                        4           L8672c99 
56  Barium  Fe  [Ar]3d8   (0,4)4    (1 864)                        4           L8672c99 
56  Barium  Mn  [Ar]3d7   4F9/2    (1 958)                        4           L8672c99 
56  Barium  Cr  [Ar]3d6   5D4    (2 047)                        4           L8672c99 
56  Barium  [Ar]3d5   6S5/2    (2 142)                        5           L8672c99 
56  Barium  Ti  [Ar]3d4   5D0    (2 256)                        5           L8672c99 
56  Barium  Sc  [Ar]3d3   4F3/2    (2 349)                        5           L8672c99 
56  Barium  Ca  [Ar]3d2   3F2    (2 452)                        5           L8672c99 
56  Barium  [Ar]3d   2D3/2    (2 547)                        4           L8672c99 
56  Barium  Ar  [Ne]3s23p6   1S0    (2 814)                        4           L8672c99 
56  Barium  Cl  [Ne]3s23p5   23/2    (2 901)                        4           L8672c99 
56  Barium  [Ne]3s23p4   3P2    (2 994)                        4           L8672c99 
56  Barium  [Ne]3s23p3   43/2    (3 081)                        4           L8672c99 
56  Barium  Si  [Ne]3s23p2   3P0    (3 266)                        4           L8672c99 
56  Barium  Al  [Ne]3s23p   21/2    (3 363)                        4           L8672c99 
56  Barium  Mg  [Ne]3s2   1S0    (3 546)                        4           L8672c99 
56  Barium  Na  [Ne]3s   2S1/2    (3 640)                        4           L8672c99 
56  Barium  Ne  1s22s22p6   1S0    (8 326)                        4           L8672c99 
56  Barium  1s22s22p5   23/2    (8 565)                        4           L8672c99 
56  Barium  1s22s22p4   (0,2)2    (8 831)                        4           L8672c99 
56  Barium  1s22s22p3   (0,3/23/2    (9 077)                        4           L8672c99 
56  Barium  1s22s22p2   3P0    (9 739)                        4           L8672c99 
56  Barium  1s22s22p   21/2    (10 023)                        4           L8672c99 
56  Barium  Be  1s22s2   1S0    (10 376)                        4           L8672c99 
56  Barium  Li  1s22s   2S1/2    (10 616.42)                     0.05        L16264c99 
56  Barium  He  1s2   1S0    (43 485.37)                     0.04        L21139 
56  Barium  1s   2S1/2    (44 561.633)                    0.024       L19200 
Notes:
Designations used in the ground shell lists:
[Ne] = 1s22s22p6
[Ar] = 1s22s22p63s23p6
[Kr] = 1s22s22p63s23p63d104s24p6
[Cd] = 1s22s22p63s23p63d104s24p64d105s2
[Xe] = 1s22s22p63s23p63d104s24p64d105s25p6

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