Abstract
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.
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