Self-consistent relativistic Dirac-Hartree-Fock calculations have been made of some lowlying electronic energies for the atoms of all elements in ground-state $d{s}^2$ electron configurations. The results indicate that, contrary to some previous estimates, the ground electronic state of atomic Lr could be in either the $5f^{14}6d7s^2$ or the $5f^{14}7p7s^2$ electron configuration. The separation between the lowest energy level of the $5f^{14}6d7s^2$ configuration and the lowest energy level of the $5f^{14}7p7s^2$ configuration is estimated to be (0 ± 3) × ${10}^3$ ${\mathrm{cm}}^{-1\mathrm{}}$ for atomic Lr.

• Received 21 January 1974

DOI:https://doi.org/10.1103/PhysRevA.9.2270