Meitnerium (Mt, Z = 109): atomic energy levels
No energy level diagram can be drawn for neutral meitnerium: 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 6d7 7s2 theory | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 99, 042509 (2019), arXiv:1902.06819v2, p. 13 Table IV |
| Ground term | 4F9/2 theory | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 99, 042509 (2019), arXiv:1902.06819v2, p. 13 Table IV |
| First ionisation energy | 9.86 eV theory | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 99, 042509 (2019), arXiv:1902.06819v2, p. 16 Table VIII |
| Longest-lived isotope | 277Mt, half-life 9 ± 6 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 277Mt |
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 |
|---|---|---|---|---|---|---|
| 6d7 7s2 4F9/2 (ground) | 6d7 7s7p 6F*11/2 (state 17) | 38027 | 263.0 | E1 | 3.33e+07 | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 99, 042509 (2019), arXiv:1902.06819v2, p. 12-13 Tables III-IV (energy) and p. 14 Table V (rate) |
| 6d7 7s2 4F9/2 (ground) | 6d7 7s7p 6D*9/2 (state 13) | 33505 | 298.5 | E1 | 1.23e+07 | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 99, 042509 (2019), arXiv:1902.06819v2, p. 12-13 Tables III-IV (energy) and p. 14 Table V (rate) |
| 6d7 7s2 4F9/2 (ground) | 6d6 7s2 7p, J=7/2 odd (state 15) | 35117 | 284.8 | E1 | 9.46e+05 | B.G.C. Lackenby, V.A. Dzuba, V.V. Flambaum, Phys. Rev. A 99, 042509 (2019), arXiv:1902.06819v2, p. 12-13 Tables III-IV (energy) and p. 14 Table V (rate) |