Towards a 32-Electron Principle: Pu@Pb12 and Related Systems

摘要

The 18-electron principle goes back to Langmuir.[1] Its history and interpretation were the subject of a recent paper.[2] Formally it corresponds to fully occupying the ns, np, and (n-1)d orbitals at a central atom. In fact, the kinetic-energy separation of the ligand orbitals, because of their nodal structures, demands that all 18 states are occupied, even if the metal np (or ns) character happens to be negligible.