Abstract
The low-lying electronic states of and Rf are investigated by the relativistic coupled cluster method based on the Dirac-Coulomb-Breit Hamiltonian. A large basis set () of Gaussian-type orbitals is used. The external 36 electrons are correlated. In contrast with recent multiconfiguration Dirac-Fock (MCDF) results, the state is found to be the ground state of the atom, lying about 0.30 eV below the state (the MCDF ground state). The dynamic correlation of the system, requiring virtual orbitals with up to 6, is responsible for the reversal. The first ionization potential of the atom is predicted at 6.01 eV.
- Received 11 October 1994
DOI:https://doi.org/10.1103/PhysRevLett.74.1079
©1995 American Physical Society