Copernicium (Cn, Z = 112): atomic energy levels
No energy level diagram can be drawn for neutral copernicium: no excited level of the atom has been measured, so there is no observed transition to show. This page lists what is known instead, and marks every calculated number as theory.
What has been measured
No atomic-physics measurement. Only gas-phase adsorption chromatography of single atoms in the elemental state, which confirmed Cn as the least reactive member of group 12.
| Quantity | Value | Source |
|---|---|---|
| Ground configuration | [Rn] 5f14 6d10 7s2 theory | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 6 Table V |
| Ground term | 1S0 theory | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 6 Table V |
| First ionisation energy | 12.145 eV theory | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 9 Table VIII |
| Longest-lived isotope | 285Cn, half-life 30 ± 8 s | NUBASE2020: F.G. Kondev, M. Wang, W.J. Huang, S. Naimi, G. Audi, Chin. Phys. C 45, 030001 (2021), machine-readable table nubase_4.mas20.txt, line for 285Cn |
Calculated transitions from the ground state
Theory only: none of these lines has been observed. Wavelengths are converted from the calculated level energies.
| Lower level | Upper level | Energy (cm⁻¹) | λ vacuum (nm) | Type | A (s⁻¹) theory | Source |
|---|---|---|---|---|---|---|
| 6d10 7s2 1S0 (ground) | 6d10 7s7p 3P*1 | 47293 | 211.4 | intercombination | – | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 6 Table V |
| 6d10 7s2 1S0 (ground) | 6d9 7s2 7p, J=1 odd, (6d5/2,7p3/2) | 58260 | 171.6 | E1 | – | T.H. Dinh, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 78, 062502 (2008), arXiv:0810.2507v1, p. 5 Table III (method B) |
| 6d10 7s2 1S0 (ground) | 6d10 7s7p 1P*1 | 78697 | 127.1 | E1 | – | T.H. Dinh, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 78, 062502 (2008), arXiv:0810.2507v1, p. 5 Table III (method B) |