NIST Atomic Spectra Database Ionization Energies Data
Multiple spectra |
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, May 20]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
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At. Num. | Sp. Name. | Ion Charge | El. name | Isoel. Seq. | Ground Shells a | Ground Level | Ionized Level | Ionization Energy (eV) |
Uncertaintyb (eV) |
References |
---|---|---|---|---|---|---|---|---|---|---|
2 | He II | +1 | Helium | H | 1s | 2S1/2 | (54.4177655282) | 0.0000000010 | L19200 | |
3 | Li II | +1 | Lithium | He | 1s2 | 1S0 | 1s 2S1/2 | (75.6400970) | 0.0000012 | L10054 |
4 | Be II | +1 | Beryllium | Li | 1s22s | 2S1/2 | 1s2 1S0 | 18.21115 | 0.00004 | L12158 |
5 | B II | +1 | Boron | Be | 1s22s2 | 1S0 | 2s 2S1/2 | 25.15483 | 0.00005 | L12120 |
6 | C II | +1 | Carbon | B | 1s22s22p | 2P°1/2 | 2s2 1S0 | 24.383143 | 0.000012 | L22145 |
7 | N II | +1 | Nitrogen | C | 1s22s22p2 | 3P0 | 2p 2P°1/2 | [29.60125] | 0.00009 | L11770 |
8 | O II | +1 | Oxygen | N | 1s22s22p3 | 4S°3/2 | 2p2 3P0 | 35.12112 | 0.00006 | L11267,L10621 |
9 | F II | +1 | Fluorine | O | 1s22s22p4 | 3P2 | 2p3 4S°3/2 | 34.97081 | 0.00012 | L369 |
10 | Ne II | +1 | Neon | F | 1s22s22p5 | 2P°3/2 | 2p4 3P2 | 40.96297 | 0.00004 | L1406 |
11 | Na II | +1 | Sodium | Ne | 1s22s22p6 | 1S0 | 2p5 2P°3/2 | 47.28636 | 0.00025 | L914 |
12 | Mg II | +1 | Magnesium | Na | [Ne]3s | 2S1/2 | 2p6 1S0 | 15.035271 | 0.000006 | L10635 |
13 | Al II | +1 | Aluminum | Mg | [Ne]3s2 | 1S0 | 3s 2S1/2 | 18.82855 | 0.00005 | L7215 |
14 | Si II | +1 | Silicon | Al | [Ne]3s23p | 2P°1/2 | 3s2 1S0 | 16.34585 | 0.00004 | L5815 |
15 | P II | +1 | Phosphorus | Si | [Ne]3s23p2 | 3P0 | 3p 2P°1/2 | [19.76949] | 0.00004 | L11770 |
16 | S II | +1 | Sulfur | P | [Ne]3s23p3 | 4S°3/2 | 3p2 3P0 | 23.33788 | 0.00025 | L7237,L5883 |
17 | Cl II | +1 | Chlorine | S | [Ne]3s23p4 | 3P2 | 3p3 4S°3/2 | 23.81364 | 0.00012 | L1617 |
18 | Ar II | +1 | Argon | Cl | [Ne]3s23p5 | 2P°3/2 | 3p4 3P2 | 27.62967 | 0.00012 | L8844 |
19 | K II | +1 | Potassium | Ar | [Ne]3s23p6 | 1S0 | 3p5 2P°3/2 | 31.62500 | 0.00019 | L12188 |
20 | Ca II | +1 | Calcium | K | [Ar]4s | 2S1/2 | 3p6 1S0 | 11.871719 | 0.000004 | L7185,L7323 |
21 | Sc II | +1 | Scandium | Ca | [Ar]3d4s | 3D1 | 3d 2D3/2 | 12.79977 | 0.00025 | L7185,L5141 |
22 | Ti II | +1 | Titanium | Sc | [Ar]3d24s | 4F3/2 | 3d2 3F2 | 13.5755 | 0.0025 | L7185,L5432 |
23 | V II | +1 | Vanadium | Ti | [Ar]3d4 | 5D0 | 3d3 4F3/2 | 14.634 | 0.007 | L20009 |
24 | Cr II | +1 | Chromium | V | [Ar]3d5 | 6S5/2 | 3d4 5D0 | 16.486305 | 0.000015 | L18847 |
25 | Mn II | +1 | Manganese | Cr | [Ar]3d54s | 7S3 | 3d5 6S5/2 | 15.63999 | 0.00007 | L7185,L562 |
26 | Fe II | +1 | Iron | Mn | [Ar]3d64s | 6D9/2 | 3d6 5D4 | 16.19921 | 0.00005 | L18349 |
27 | Co II | +1 | Cobalt | Fe | [Ar]3d8 | 3F4 | 3d7 4F9/2 | 17.0844 | 0.0012 | L7185,L2115 |
28 | Ni II | +1 | Nickel | Co | [Ar]3d9 | 2D5/2 | 3d8 3F4 | 18.168838 | 0.000025 | L7185,L897 |
29 | Cu II | +1 | Copper | Ni | [Ar]3d10 | 1S0 | 3d9 2D5/2 | 20.29239 | 0.00006 | L869,L19804 |
30 | Zn II | +1 | Zinc | Cu | [Ar]3d104s | 2S1/2 | 3d10 1S0 | 17.96439 | 0.00025 | L9171,L640 |
31 | Ga II | +1 | Gallium | Zn | [Ar]3d104s2 | 1S0 | 4s 2S1/2 | 20.51514 | 0.00012 | L6473 |
32 | Ge II | +1 | Germanium | Ga | [Ar]3d104s24p | 2P°1/2 | 4s2 1S0 | 15.934610 | 0.000025 | L7213 |
33 | As II | +1 | Arsenic | Ge | [Ar]3d104s24p2 | 3P0 | 4p 2P°1/2 | 18.5892 | 0.0010 | L820 |
34 | Se II | +1 | Selenium | As | [Ar]3d104s24p3 | 4S°3/2 | 4p2 3P0 | 21.196 | 0.010 | L17234c100 |
35 | Br II | +1 | Bromine | Se | [Ar]3d104s24p4 | 3P2 | 4p3 4S°3/2 | 21.591 | L8844 | |
36 | Kr II | +1 | Krypton | Br | [Ar]3d104s24p5 | 2P°3/2 | 4p4 3P2 | 24.35984 | 0.00012 | L7212,L353 |
37 | Rb II | +1 | Rubidium | Kr | [Ar]3d104s24p6 | 1S0 | 4p5 2P°3/2 | 27.28954 | 0.00006 | L2590 |
38 | Sr II | +1 | Strontium | Rb | [Kr]5s | 2S1/2 | 4p6 1S0 | 11.0302765 | 0.0000025 | L13983 |
39 | Y II | +1 | Yttrium | Sr | [Kr]5s2 | 1S0 | 4d 2D3/2 | 12.2236 | 0.0006 | L10987 |
40 | Zr II | +1 | Zirconium | Y | [Kr]4d25s | 4F3/2 | 4d2 3F2 | 13.13 | L272 | |
41 | Nb II | +1 | Niobium | Zr | [Kr]4d4 | 5D0 | 4d3 4F3/2 | [14.32] | L3466 | |
42 | Mo II | +1 | Molybdenum | Nb | [Kr]4d5 | 6S5/2 | 4d4 5D0 | [16.16] | 0.12 | L10502,L17501 |
43 | Tc II | +1 | Technetium | Mo | [Kr]4d55s | 7S3 | 4d5 6S5/2 | [15.26] | L3466,L17503 | |
44 | Ru II | +1 | Ruthenium | Tc | [Kr]4d7 | 4F9/2 | 4d6 5D4 | [16.76] | 0.06 | L17219 |
45 | Rh II | +1 | Rhodium | Ru | [Kr]4d8 | 3F4 | 4d7 4F9/2 | [18.08] | L3466 | |
46 | Pd II | +1 | Palladium | Rh | [Kr]4d9 | 2D5/2 | 4d8 3F4 | [19.43] | 0.12 | L3466,L17501 |
47 | Ag II | +1 | Silver | Pd | [Kr]4d10 | 1S0 | 4d9 2D5/2 | 21.4844 | 0.0009 | L18362 |
48 | Cd II | +1 | Cadmium | Ag | [Kr]4d105s | 2S1/2 | 4d10 1S0 | 16.908313 | 0.000012 | L3540 |
49 | In II | +1 | Indium | Cd | [Kr]4d105s2 | 1S0 | 5s 2S1/2 | 18.87041 | 0.00003 | L18318 |
50 | Sn II | +1 | Tin | In | [Cd]5p | 2P°1/2 | 5s2 1S0 | 14.63307 | 0.00009 | L18891 |
51 | Sb II | +1 | Antimony | Sn | [Cd]5p2 | 3P0 | 5s25p 2P1/2 | 16.626 | 0.025 | L16370,L8844 |
52 | Te II | +1 | Tellurium | Sb | [Cd]5p3 | 4S°3/2 | 5s25p2 3P0 | 18.6 | 0.4 | L3546 |
53 | I II | +1 | Iodine | Te | [Cd]5p4 | 3P2 | 5s25p3 4S3/2 | 19.13126 | 0.00012 | L7360 |
54 | Xe II | +1 | Xenon | I | [Cd]5p5 | 2P°3/2 | 5s25p4 3P2 | [20.975] | 0.004 | L6925 |
55 | Cs II | +1 | Cesium | Xe | [Cd]5p6 | 1S0 | 5s25p5 2P°3/2 | 23.15745 | 0.00006 | L6838 |
56 | Ba II | +1 | Barium | Cs | [Xe]6s | 2S1/2 | 5s25p6 1S0 | 10.003826 | 0.000012 | L9224 |
57 | La II | +1 | Lanthanum | Ba | [Xe]5d2 | 3F2 | 5s25p65d 2D3/2 | 11.18496 | 0.00006 | L8469 |
58 | Ce II | +1 | Cerium | La | [Xe]4f5d2 | 4H°7/2 | 4f25s25p6 3H4 | [10.956] | 0.020 | L19870c180 |
59 | Pr II | +1 | Praseodymium | Ce | [Xe]4f36s | (9/2,1/2)°4 | 4f35s25p6 4I°9/2 | [10.631] | 0.020 | L19870c180 |
60 | Nd II | +1 | Neodymium | Pr | [Xe]4f46s | 6I7/2 | 4f45s25p6 5I4 | [10.783] | 0.020 | L19870c180 |
61 | Pm II | +1 | Promethium | Nd | [Xe]4f56s | 7H°2 | 4f55s25p6 6H°5/2 | [10.938] | 0.020 | L19870c180 |
62 | Sm II | +1 | Samarium | Pm | [Xe]4f66s | 8F1/2 | 4f65s25p6 7F0 | [11.078] | 0.020 | L19870c180 |
63 | Eu II | +1 | Europium | Sm | [Xe]4f76s | 9S°4 | 4f75s25p6 8S°7/2 | [11.240] | 0.006 | L19870 |
64 | Gd II | +1 | Gadolinium | Eu | [Xe]4f75d6s | 10D°5/2 | 4f75p65d 9D°2 | [12.076] | 0.020 | L19870c180 |
65 | Tb II | +1 | Terbium | Gd | [Xe]4f96s | (15/2,1/2)°8 | 4f95p6 6H°15/2 | [11.513] | 0.020 | L19870c180 |
66 | Dy II | +1 | Dysprosium | Tb | [Xe]4f106s | (8,1/2)17/2 | 4f105p6 5I8 | [11.647] | 0.020 | L19870c180 |
67 | Ho II | +1 | Holmium | Dy | [Xe]4f116s | (15/2,1/2)°8 | 4f11 4I°15/2 | [11.781] | 0.020 | L19870c180 |
68 | Er II | +1 | Erbium | Ho | [Xe]4f126s | (6,1/2)13/2 | 4f125p6 3H6 | [11.916] | 0.020 | L19870c180 |
69 | Tm II | +1 | Thulium | Er | [Xe]4f136s | (7/2,1/2)°4 | 4f135p6 2F°7/2 | [12.065] | 0.020 | L19870c180 |
70 | Yb II | +1 | Ytterbium | Tm | [Xe]4f146s | 2S1/2 | 4f14 1S0 | 12.179185 | 0.000025 | L12907 |
71 | Lu II | +1 | Lutetium | Yb | [Xe]4f146s2 | 1S0 | 6s 2S1/2 | [14.13] | 0.05 | L19870c180 |
72 | Hf II | +1 | Hafnium | Lu | [Xe]4f145d6s2 | 2D3/2 | 5d2 3F2 | (14.61) | 0.04 | L19691 |
73 | Ta II | +1 | Tantalum | Hf | [Xe]4f145d36s | 5F1 | 5d3 4F3/2 | [16.2] | 0.5 | L16139 |
74 | W II | +1 | Tungsten | Ta | [Xe]4f145d46s | 6D1/2 | 5d4 5D0 | [16.37] | 0.15 | L12177 |
75 | Re II | +1 | Rhenium | W | [Xe]4f145d56s | 7S3 | 5d5 6S5/2 | [16.6] | 0.5 | L16139 |
76 | Os II | +1 | Osmium | Re | [Xe]4f145d66s | 6D9/2 | 5d6 5D4 | [17.0] | 1.0 | L16139 |
77 | Ir II | +1 | Iridium | Os | [Xe]4f145d76s | 5F5 | 5d7 4F9/2 | [17.0] | 0.3 | L16139 |
78 | Pt II | +1 | Platinum | Ir | [Xe]4f145d9 | 2D5/2 | 5d8 3F4 | 18.56 | 0.12 | L3466,L3539 |
79 | Au II | +1 | Gold | Pt | [Xe]4f145d10 | 1S0 | 5d9 2D5/2 | 20.203 | 0.025 | L11702 |
80 | Hg II | +1 | Mercury | Au | [Xe]4f145d106s | 2S1/2 | 5d10 1S0 | 18.75688 | 0.00004 | L11760 |
81 | Tl II | +1 | Thallium | Hg | [Xe]4f145d106s2 | 1S0 | 6s 2S1/2 | 20.4283 | 0.0006 | L3272 |
82 | Pb II | +1 | Lead | Tl | [Hg]6p | 2P°1/2 | 6s2 1S0 | 15.032499 | 0.000007 | L15205 |
83 | Bi II | +1 | Bismuth | Pb | [Hg]6p2 | 3P0 | 6s26p 2P°1/2 | 16.703 | 0.004 | L6771 |
84 | Po II | +1 | Polonium | Bi | [Hg]6p3 | 4S°3/2 | 6p2 3P0 | [19.3] | 1.7 | L16139 |
85 | At II | +1 | Astatine | Po | [Hg]6p4 | 3P2 | 6p3 4S°3/2 | [17.880] | 0.020 | L15918 |
86 | Rn II | +1 | Radon | At | [Hg]6p5 | 2P°3/2 | 6p4 3P2 | (18.99) | 0.06 | L22090 |
87 | Fr II | +1 | Francium | Rn | [Hg]6p6 | 1S0 | 6p5 2P°3/2 | [22.4] | 1.9 | L16139 |
88 | Ra II | +1 | Radium | Fr | [Rn]7s | 2S1/2 | 6p6 1S0 | 10.14718 | 0.00006 | L19486 |
89 | Ac II | +1 | Actinium | Ra | [Rn]7s2 | 1S0 | 6p67s 2S1/2 | [11.75] | 0.03 | L15123 |
90 | Th II | +1 | Thorium | Ac | [Rn]6d7s2 | 2D3/2 | 5f6d 3H°4 | 12.10 | 0.20 | L18620 |
91 | Pa II | +1 | Protactinium | Th | [Rn]5f27s2 | 3H4 | 5f26d 4I11/2 | [11.9] | 0.4 | L13741c99 |
92 | U II | +1 | Uranium | Pa | [Rn]5f37s2 | 4I°9/2 | 5f4 5I4 | 11.6 | 0.4 | L14620 |
93 | Np II | +1 | Neptunium | U | [Rn]5f46d7s | 7L5 | 5f5 6H°5/2 | [11.5] | 0.4 | L13741c99 |
94 | Pu II | +1 | Plutonium | Np | [Rn]5f67s | 8F1/2 | 5f6 7F0 | [11.5] | 0.4 | L13741c99 |
95 | Am II | +1 | Americium | Pu | [Rn]5f77s | 9S°4 | 5f7 8S°7/2 | [11.7] | 0.4 | L13741c99 |
96 | Cm II | +1 | Curium | Am | [Rn]5f77s2 | 8S°7/2 | 5f8 7F6 | [12.4] | 0.4 | L13741c99 |
97 | Bk II | +1 | Berkelium | Cm | [Rn]5f97s | 7H°8 | 5f9 6H°15/2 | [11.9] | 0.4 | L13741c99 |
98 | Cf II | +1 | Californium | Bk | [Rn]5f107s | 6I17/2 | 5f10 5I8 | [12.0] | 0.4 | L13741c99 |
99 | Es II | +1 | Einsteinium | Cf | [Rn]5f117s | 5I°8 | 5f11 4I°15/2 | [12.2] | 0.4 | L13741c99 |
100 | Fm II | +1 | Fermium | Es | [Rn]5f127s | 4H13/2 | 5f12 3H6 | [12.4] | 0.4 | L13741c99 |
101 | Md II | +1 | Mendelevium | Fm | [Rn]5f137s | 3F°4 | 5f13 2F°7/2 | [12.4] | 0.4 | L13741c99 |
102 | No II | +1 | Nobelium | Md | [Rn]5f147s | 2S1/2 | 5f14 1S0 | (12.93) | 0.04 | L19691 |
103 | Lr II | +1 | Lawrencium | No | [Rn]5f147s2 | 1S0 | 5f147s 2S1/2 | (14.54) | 0.04 | L19691 |
104 | Rf II | +1 | Rutherfordium | Lr | [Rn]5f146d7s2 | 2D3/2 | 7s2 1S0 | (14.35) | 0.04 | L19691 |
105 | Db II | +1 | Dubnium | Rf | [Rn]5f146d27s2 | 3F2 | 6d27s 3/2 | (14.0) | 1.6 | L8672c99 |
106 | Sg II | +1 | Seaborgium | Db | [Rn]5f146d37s2 | 4F3/2 | 6d37s 1 | [17.1] | 0.5 | L7830 |
107 | Bh II | +1 | Bohrium | Sg | [Rn]5f146d47s2 | 0 | 6d47s 1/2 | [17.5] | 0.5 | L13544 |
108 | Hs II | +1 | Hassium | Bh | [Rn]5f146d57s2 | 5/2 | 6d57s 3 | [18.2] | 0.5 | L13544 |
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