CORE CHARGE POLARIZATION EFFECTS IN ATOMIC LITHIUM

The semiclassical, consistent formulation of core charge polarisation effects presented in an earlier paper has been applied to atomic lithium. When the core polarisation potential is added to a Hartree-Fock calculation one obtains accurate atomic energy levels for the valence and excited states, reasonable values for the hyperfine splitting constant of the valence S state and oscillator strengths in excellent agreement with the tabulated values. This suggests that this procedure accurately describes the non-relativistic aspects of atomic lithium. The spin-orbit splitting and atomic g shift are not given well by the standard one-particle expressions. This suggests that the one-particle expressions are invalid for relativistic corrections in many-body systems.