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, April 20]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
|
At. Num. | El. name | Ground Shells a | Ground Config. | Ground Level | Ionization Energy (Hartree) |
Uncertainty (Hartree) |
References |
---|---|---|---|---|---|---|---|
1 | Hydrogen | 1s | 1s | 2S1/2 | (0.4997332541890) | 0.0000000000011 | HDEL |
2 | Helium | 1s2 | 1s2 | 1S0 | 0.9035698802 | 0.0000000009 | L17714 |
2 | Helium | 1s | 1s | 2S1/2 | (1.99981599747) | 0.00000000004 | L19200 |
3 | Lithium | 1s22s | 1s22s | 2S1/2 | 0.1981418715 | 0.0000000008 | L12261 |
3 | Lithium | 1s2 | 1s2 | 1S0 | (2.779722295) | 0.00000004 | L10054 |
3 | Lithium | 1s | 1s | 2S1/2 | (4.500114696) | 0.000000004 | L19200 |
4 | Beryllium | 1s22s2 | 1s22s2 | 1S0 | 0.3426029 | 0.0000003 | L5964 |
4 | Beryllium | 1s22s | 1s22s | 2S1/2 | 0.6692476 | 0.0000016 | L12158 |
4 | Beryllium | 1s2 | 1s2 | 1S0 | (5.65558121) | 0.00000014 | L10054 |
4 | Beryllium | 1s | 1s | 2S1/2 | (8.001010409) | 0.000000004 | L19200 |
5 | Boron | 1s22s22p | 2s22p | 2P°1/2 | 0.30494659 | 0.00000010 | L12312 |
5 | Boron | 1s22s2 | 1s22s2 | 1S0 | 0.9244230 | 0.0000018 | L12120 |
5 | Boron | 1s22s | 1s22s | 2S1/2 | 1.393923 | 0.000003 | L12547 |
5 | Boron | 1s2 | 1s2 | 1S0 | (9.53183262) | 0.0000003 | L10054 |
5 | Boron | 1s | 1s | 2S1/2 | (12.503075713) | 0.000000023 | L19200 |
6 | Carbon | 1s22s22p2 | 2s22p2 | 3P0 | 0.41380795 | 0.00000004 | L20057 |
6 | Carbon | 1s22s22p | 2s22p | 2P°1/2 | 0.8960640 | 0.0000005 | L22145 |
6 | Carbon | 1s22s2 | 1s22s2 | 1S0 | 1.759843 | 0.000009 | L876c191 |
6 | Carbon | 1s22s | 1s22s | 2S1/2 | 2.370093 | 0.000007 | L11667 |
6 | Carbon | 1s2 | 1s2 | 1S0 | (14.4090621) | 0.0000015 | L21139 |
6 | Carbon | 1s | 1s | 2S1/2 | (18.006918257) | 0.000000008 | L19200 |
7 | Nitrogen | 1s22s22p3 | 2s22p3 | 4S°3/2 | 0.5341196 | 0.0000014 | L1411 |
7 | Nitrogen | 1s22s22p2 | 2s22p2 | 3P0 | [1.087826] | 0.000003 | L11770 |
7 | Nitrogen | 1s22s22p | 2s22p | 2P°1/2 | [1.74358] | 0.00009 | L11770 |
7 | Nitrogen | 1s22s2 | 1s22s2 | 1S0 | 2.847099 | 0.000014 | L7288,L876 |
7 | Nitrogen | 1s22s | 1s22s | 2S1/2 | 3.597396 | 0.000014 | L4829 |
7 | Nitrogen | 1s2 | 1s2 | 1S0 | (20.2881030) | 0.000003 | L21139 |
7 | Nitrogen | 1s | 1s | 2S1/2 | (24.51349342) | 0.00000003 | L19200 |
8 | Oxygen | 1s22s22p4 | 2s22p4 | 3P2 | 0.5004543 | 0.0000003 | L74,L3760 |
8 | Oxygen | 1s22s22p3 | 2s22p3 | 4S°3/2 | 1.2906772 | 0.0000023 | L11267,L10621 |
8 | Oxygen | 1s22s22p2 | 2s22p2 | 3P0 | [2.018844] | 0.000005 | L11770 |
8 | Oxygen | 1s22s22p | 2s22p | 2P°1/2 | 2.844894 | 0.000009 | L648 |
8 | Oxygen | 1s22s2 | 1s22s2 | 1S0 | 4.185709 | 0.000018 | L7288 |
8 | Oxygen | 1s22s | 1s22s | 2S1/2 | [5.07578] | 0.00008 | L4713 |
8 | Oxygen | 1s2 | 1s2 | 1S0 | (27.169765) | 0.000005 | L21139 |
8 | Oxygen | 1s | 1s | 2S1/2 | (32.02372367) | 0.00000005 | L19200 |
9 | Fluorine | 1s22s22p5 | 2s22p5 | 2P°3/2 | 0.6402767 | 0.0000018 | L7481,L526 |
9 | Fluorine | 1s22s22p4 | 2s22p4 | 3P2 | 1.285154 | 0.000005 | L369 |
9 | Fluorine | 1s22s22p3 | 2s22p3 | 4S°3/2 | [2.304476] | 0.000009 | L11770 |
9 | Fluorine | 1s22s22p2 | 2s22p2 | 3P0 | [3.2036] | 0.0006 | L11770 |
9 | Fluorine | 1s22s22p | 2s22p | 2P°1/2 | [4.19857] | 0.00023 | L11770 |
9 | Fluorine | 1s22s2 | 1s22s2 | 1S0 | 5.775638 | 0.000009 | L6491 |
9 | Fluorine | 1s22s | 1s22s | 2S1/2 | 6.805488 | 0.000023 | L6335 |
9 | Fluorine | 1s2 | 1s2 | 1S0 | (35.055116) | 0.000010 | L21139 |
9 | Fluorine | 1s | 1s | 2S1/2 | (40.53882152) | 0.00000007 | L19200 |
10 | Neon | 1s22s22p6 | 2s22p6 | 1S0 | 0.7924823 | 0.0000003 | L8826,L1407 |
10 | Neon | 1s22s22p5 | 2s22p5 | 2P°3/2 | 1.5053612 | 0.0000014 | L1406 |
10 | Neon | 1s22s22p4 | 2s22p4 | 3P2 | 2.330764 | 0.000012 | L9091 |
10 | Neon | 1s22s22p3 | 2s22p3 | 4S°3/2 | [3.57167] | 0.00009 | L11782 |
10 | Neon | 1s22s22p2 | 2s22p2 | 3P0 | 4.6395 | 0.0005 | L11744 |
10 | Neon | 1s22s22p | 2s22p | 2P°1/2 | 5.80395 | 0.00018 | L9340 |
10 | Neon | 1s22s2 | 1s22s2 | 1S0 | 7.6171 | 0.0005 | L9089 |
10 | Neon | 1s22s | 1s22s | 2S1/2 | [8.78665] | 0.00007 | L9090 |
10 | Neon | 1s2 | 1s2 | 1S0 | (43.945141) | 0.000016 | L21139 |
10 | Neon | 1s | 1s | 2S1/2 | (50.05989932) | 0.00000014 | L19200 |
11 | Sodium | [Ne]3s | 2p63s | 2S1/2 | 0.188857595 | 0.000000009 | L10921,L9648 |
11 | Sodium | 1s22s22p6 | 2s22p6 | 1S0 | 1.737742 | 0.000009 | L914 |
11 | Sodium | 1s22s22p5 | 2s22p5 | 2P°3/2 | [2.63199] | 0.00005 | L5793,L2720 |
11 | Sodium | 1s22s22p4 | 2s22p4 | 3P2 | [3.6358] | 0.0005 | L11770 |
11 | Sodium | 1s22s22p3 | 2s22p3 | 4S°3/2 | 5.0862 | 0.0005 | L7482 |
11 | Sodium | 1s22s22p2 | 2s22p2 | 3P0 | [6.3293] | 0.0018 | L11770 |
11 | Sodium | 1s22s22p | 2s22p | 2P°1/2 | [7.6624] | 0.0005 | L11770 |
11 | Sodium | 1s22s2 | 1s22s2 | 1S0 | [9.7089] | 0.0008 | L11770 |
11 | Sodium | 1s22s | 1s22s | 2S1/2 | (11.0195) | 0.0003 | L16264c99 |
11 | Sodium | 1s2 | 1s2 | 1S0 | (53.841401) | 0.000025 | L21139 |
11 | Sodium | 1s | 1s | 2S1/2 | (60.58869145) | 0.00000018 | L19200 |
12 | Magnesium | [Ne]3s2 | 2p63s2 | 1S0 | 0.28099398 | 0.00000014 | L10635,L6969 |
12 | Magnesium | [Ne]3s | 2p63s | 2S1/2 | 0.55253602 | 0.00000023 | L10635 |
12 | Magnesium | 1s22s22p6 | 2s22p6 | 1S0 | 2.945224 | 0.000023 | L4995,L1434 |
12 | Magnesium | 1s22s22p5 | 2s22p5 | 2P°3/2 | [4.01543] | 0.00005 | L4995,L2720 |
12 | Magnesium | 1s22s22p4 | 2s22p4 | 3P2 | [5.1939] | 0.0012 | L11770 |
12 | Magnesium | 1s22s22p3 | 2s22p3 | 4S°3/2 | [6.8632] | 0.0023 | L10635 |
12 | Magnesium | 1s22s22p2 | 2s22p2 | 3P0 | [8.2692] | 0.0021 | L11770 |
12 | Magnesium | 1s22s22p | 2s22p | 2P°1/2 | [9.7725] | 0.0007 | L11770 |
12 | Magnesium | 1s22s2 | 1s22s2 | 1S0 | [12.0532] | 0.0014 | L11770 |
12 | Magnesium | 1s22s | 1s22s | 2S1/2 | (13.5050) | 0.0003 | L16264c99 |
12 | Magnesium | 1s2 | 1s2 | 1S0 | (64.745138) | 0.00004 | L21139 |
12 | Magnesium | 1s | 1s | 2S1/2 | (72.1265676) | 0.0000003 | L19200 |
13 | Aluminum | [Ne]3s23p | 3s23p | 2P°1/2 | 0.21997294 | 0.00000011 | L7215,L10321 |
13 | Aluminum | [Ne]3s2 | 2p63s2 | 1S0 | 0.6919365 | 0.0000018 | L7215 |
13 | Aluminum | [Ne]3s | 2p63s | 2S1/2 | 1.0454316 | 0.0000009 | L4714,L277 |
13 | Aluminum | 1s22s22p6 | 2s22p6 | 1S0 | 4.40964 | 0.00007 | L4714,L2829 |
13 | Aluminum | 1s22s22p5 | 2s22p5 | 2P°3/2 | [5.65297] | 0.00009 | L4714,L3565 |
13 | Aluminum | 1s22s22p4 | 2s22p4 | 3P2 | [7.0004] | 0.0018 | L7215 |
13 | Aluminum | 1s22s22p3 | 2s22p3 | 4S°3/2 | [8.884] | 0.003 | L7215 |
13 | Aluminum | 1s22s22p2 | 2s22p2 | 3P0 | [10.460] | 0.003 | L11770 |
13 | Aluminum | 1s22s22p | 2s22p | 2P°1/2 | [12.1351] | 0.0013 | L11770 |
13 | Aluminum | 1s22s2 | 1s22s2 | 1S0 | [14.6500] | 0.0021 | L11770 |
13 | Aluminum | 1s22s | 1s22s | 2S1/2 | (16.2434) | 0.0003 | L16264c99 |
13 | Aluminum | 1s2 | 1s2 | 1S0 | (76.658238) | 0.000006 | L21139 |
13 | Aluminum | 1s | 1s | 2S1/2 | (84.6755964) | 0.0000005 | L19200 |
14 | Silicon | [Ne]3s23p2 | 3s23p2 | 3P0 | 0.2995688 | 0.0000011 | L5815 |
14 | Silicon | [Ne]3s23p | 3s23p | 2P°1/2 | 0.6006988 | 0.0000014 | L5815 |
14 | Silicon | [Ne]3s2 | 2p63s2 | 1S0 | 1.230845 | 0.000003 | L5815 |
14 | Silicon | [Ne]3s | 2p63s | 2S1/2 | 1.658930 | 0.000003 | L5815,L6098 |
14 | Silicon | 1s22s22p6 | 2s22p6 | 1S0 | 6.12859 | 0.00011 | L3934 |
14 | Silicon | 1s22s22p5 | 2s22p5 | 2P°3/2 | [7.54388] | 0.00018 | c192 |
14 | Silicon | 1s22s22p4 | 2s22p4 | 3P2 | [9.0613] | 0.0018 | c193 |
14 | Silicon | 1s22s22p3 | 2s22p3 | 4S°3/2 | [11.1568] | 0.0019 | c193 |
14 | Silicon | 1s22s22p2 | 2s22p2 | 3P0 | [12.9095] | 0.0023 | c193 |
14 | Silicon | 1s22s22p | 2s22p | 2P°1/2 | [14.7505] | 0.0015 | L11770 |
14 | Silicon | 1s22s2 | 1s22s2 | 1S0 | [17.5027] | 0.0007 | c192 |
14 | Silicon | 1s22s | 1s22s | 2S1/2 | (19.2352) | 0.0003 | L16264c99 |
14 | Silicon | 1s2 | 1s2 | 1S0 | (89.582281) | 0.000006 | L21139 |
14 | Silicon | 1s | 1s | 2S1/2 | (98.2374780) | 0.0000006 | L19200 |
15 | Phosphorus | [Ne]3s23p3 | 3s23p3 | 4S°3/2 | 0.3853786 | 0.0000005 | L5148 |
15 | Phosphorus | [Ne]3s23p2 | 3s23p2 | 3P0 | [0.7265154] | 0.0000014 | L11770 |
15 | Phosphorus | [Ne]3s23p | 3s23p | 2P°1/2 | 1.109926 | 0.000003 | L7147 |
15 | Phosphorus | [Ne]3s2 | 2p63s2 | 1S0 | 1.890527 | 0.000005 | L7147 |
15 | Phosphorus | [Ne]3s | 2p63s | 2S1/2 | 2.389629 | 0.000005 | L7147,L2613 |
15 | Phosphorus | 1s22s22p6 | 2s22p6 | 1S0 | [8.10067] | 0.00017 | L11770 |
15 | Phosphorus | 1s22s22p5 | 2s22p5 | 2P°3/2 | [9.6859] | 0.0023 | L7147 |
15 | Phosphorus | 1s22s22p4 | 2s22p4 | 3P2 | [11.378] | 0.004 | L7147 |
15 | Phosphorus | 1s22s22p3 | 2s22p3 | 4S°3/2 | [13.682] | 0.008 | L11770 |
15 | Phosphorus | 1s22s22p2 | 2s22p2 | 3P0 | [15.596] | 0.003 | L11770 |
15 | Phosphorus | 1s22s22p | 2s22p | 2P°1/2 | [17.6191] | 0.0018 | L11770 |
15 | Phosphorus | 1s22s2 | 1s22s2 | 1S0 | [20.602] | 0.004 | L11770 |
15 | Phosphorus | 1s22s | 1s22s | 2S1/2 | (22.4810) | 0.0003 | L16264c99 |
15 | Phosphorus | 1s2 | 1s2 | 1S0 | (103.519485) | 0.000007 | L21139 |
15 | Phosphorus | 1s | 1s | 2S1/2 | (112.8146180) | 0.0000005 | L19200 |
16 | Sulfur | [Ne]3s23p4 | 3s23p4 | 3P2 | 0.380723 | 0.000005 | L7237 |
16 | Sulfur | [Ne]3s23p3 | 3s23p3 | 4S°3/2 | 0.857651 | 0.000009 | L7237,L5883 |
16 | Sulfur | [Ne]3s23p2 | 3s23p2 | 3P0 | [1.2809] | 0.0014 | L11770 |
16 | Sulfur | [Ne]3s23p | 3s23p | 2P°1/2 | [1.7354] | 0.0005 | L7237 |
16 | Sulfur | [Ne]3s2 | 2p63s2 | 1S0 | 2.667799 | 0.000014 | L7237 |
16 | Sulfur | [Ne]3s | 2p63s | 2S1/2 | 3.235885 | 0.000014 | L7237,L4882 |
16 | Sulfur | 1s22s22p6 | 2s22p6 | 1S0 | 10.3249 | 0.0003 | L9896 |
16 | Sulfur | 1s22s22p5 | 2s22p5 | 2P°3/2 | 12.0829 | 0.0003 | L11242 |
16 | Sulfur | 1s22s22p4 | 2s22p4 | 3P2 | [13.959] | 0.008 | L11770 |
16 | Sulfur | 1s22s22p3 | 2s22p3 | 4S°3/2 | [16.454] | 0.010 | L11770 |
16 | Sulfur | 1s22s22p2 | 2s22p2 | 3P0 | [18.542] | 0.005 | L11770 |
16 | Sulfur | 1s22s22p | 2s22p | 2P°1/2 | [20.7416] | 0.0020 | L11770 |
16 | Sulfur | 1s22s2 | 1s22s2 | 1S0 | [23.959] | 0.005 | L11770 |
16 | Sulfur | 1s22s | 1s22s | 2S1/2 | (25.9815) | 0.0003 | L16264c99 |
16 | Sulfur | 1s2 | 1s2 | 1S0 | (118.471751) | 0.000007 | L21139 |
16 | Sulfur | 1s | 1s | 2S1/2 | (128.4090596) | 0.0000007 | L19200 |
17 | Chlorine | [Ne]3s23p5 | 3s23p5 | 2P°3/2 | 0.4765517 | 0.0000006 | L19191 |
17 | Chlorine | [Ne]3s23p4 | 3s23p4 | 3P2 | 0.875135 | 0.000005 | L1617 |
17 | Chlorine | [Ne]3s23p3 | 3s23p3 | 4S°3/2 | [1.462] | 0.004 | L11770 |
17 | Chlorine | [Ne]3s23p2 | 3s23p2 | 3P0 | [1.957] | 0.004 | L11770 |
17 | Chlorine | [Ne]3s23p | 3s23p | 2P°1/2 | [2.487] | 0.004 | L11770 |
17 | Chlorine | [Ne]3s2 | 2p63s2 | 1S0 | [3.5626] | 0.0014 | L11770 |
17 | Chlorine | [Ne]3s | 2p63s | 2S1/2 | 4.196822 | 0.000023 | L6356 |
17 | Chlorine | 1s22s22p6 | 2s22p6 | 1S0 | 12.8000 | 0.0003 | L6972 |
17 | Chlorine | 1s22s22p5 | 2s22p5 | 2P°3/2 | 14.7310 | 0.0005 | L9369 |
17 | Chlorine | 1s22s22p4 | 2s22p4 | 3P2 | [16.783] | 0.015 | L11770 |
17 | Chlorine | 1s22s22p3 | 2s22p3 | 4S°3/2 | [19.476] | 0.013 | L11770 |
17 | Chlorine | 1s22s22p2 | 2s22p2 | 3P0 | [21.740] | 0.007 | L11770 |
17 | Chlorine | 1s22s22p | 2s22p | 2P°1/2 | [24.119] | 0.005 | L11770 |
17 | Chlorine | 1s22s2 | 1s22s2 | 1S0 | [27.570] | 0.007 | L11770 |
17 | Chlorine | 1s22s | 1s22s | 2S1/2 | (29.7375) | 0.0003 | L16264c99 |
17 | Chlorine | 1s2 | 1s2 | 1S0 | (134.441650) | 0.000008 | L21139 |
17 | Chlorine | 1s | 1s | 2S1/2 | (145.023548) | 0.000003 | L19200 |
18 | Argon | [Ne]3s23p6 | 3s23p6 | 1S0 | 0.579155054 | 0.000000018 | L9217 |
18 | Argon | [Ne]3s23p5 | 3s23p5 | 2P°3/2 | 1.015372 | 0.000005 | L8844 |
18 | Argon | [Ne]3s23p4 | 3s23p4 | 3P2 | [1.4970] | 0.0005 | L8114 |
18 | Argon | [Ne]3s23p3 | 3s23p3 | 4S°3/2 | [2.190] | 0.007 | L11770 |
18 | Argon | [Ne]3s23p2 | 3s23p2 | 3P0 | [2.750] | 0.006 | L11770 |
18 | Argon | [Ne]3s23p | 3s23p | 2P°1/2 | 3.3548 | 0.0004 | L12277 |
18 | Argon | [Ne]3s2 | 2p63s2 | 1S0 | [4.5721] | 0.0021 | L11770 |
18 | Argon | [Ne]3s | 2p63s | 2S1/2 | [5.27194] | 0.00005 | L4344 |
18 | Argon | 1s22s22p6 | 2s22p6 | 1S0 | [15.5302] | 0.0021 | L11770 |
18 | Argon | 1s22s22p5 | 2s22p5 | 2P°3/2 | [17.631] | 0.005 | L11242c99 |
18 | Argon | 1s22s22p4 | 2s22p4 | 3P2 | [19.861] | 0.024 | L11770 |
18 | Argon | 1s22s22p3 | 2s22p3 | 4S°3/2 | [22.746] | 0.016 | L11770 |
18 | Argon | 1s22s22p2 | 2s22p2 | 3P0 | [25.191] | 0.010 | L11770 |
18 | Argon | 1s22s22p | 2s22p | 2P°1/2 | [27.750] | 0.008 | L11770 |
18 | Argon | 1s22s2 | 1s22s2 | 1S0 | [31.438] | 0.010 | L11770 |
18 | Argon | 1s22s | 1s22s | 2S1/2 | (33.7496) | 0.0003 | L16264c99 |
18 | Argon | 1s2 | 1s2 | 1S0 | (151.431667) | 0.000008 | L21139 |
18 | Argon | 1s | 1s | 2S1/2 | (162.6607343) | 0.0000014 | L19200 |
If you did not find the data you need, please inform the ASD Team.