Roentgenium (Rg, Z = 111): atomic energy levels
No energy level diagram can be drawn for neutral roentgenium: 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
Nothing beyond nuclear decay properties: no atomic-physics measurement and no chemistry experiment (Steinegger 2021: Mt, Ds and Rg 'have yet dodged a chemical assessment completely').
| Quantity | Value | Source |
|---|---|---|
| Ground configuration | [Rn] 5f14 6d9 7s2 theory | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 5 Table III |
| Ground term | 2D5/2 theory | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 5 Table III |
| First ionisation energy | 11.175 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 | 282Rg, half-life 130 ± 50 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 282Rg |
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 |
|---|---|---|---|---|---|---|
| 6d9 7s2 2D5/2 (ground) | 6d9 7s7p 4P*5/2 | 42709 | 234.1 | E1 | 2.29e+07 | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 5 Table III and p. 8 Table VII |
| 6d9 7s2 2D5/2 (ground) | 6d8 7s2 7p, J=3/2 odd (state 1o3/2) | 32677 | 306.0 | E1 | 4.2e+06 | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 5 Table III and p. 8 Table VII |
| 6d9 7s2 2D5/2 (ground) | 6d8 7s2 7p, J=5/2 odd (state 1o5/2) | 34398 | 290.7 | E1 | 1.92e+06 | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 101, 012514 (2020), arXiv:1910.01414v1, p. 5 Table III and p. 8 Table VII |