Theoretical evaluation of the g shift in the alkali metals

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Abstract
A numerical evaluation of a very recent reformulation of the theoretical expression for the conduction electron g shift in metals is carried out. The calculations use the spherical cellular approximation in which, in each case, the cellular potential in the one-electron Schrodinger equation is approximated by a single spherically-symmetric ion-core potential plus the Hartree field of a uniform charge distribution equal to the average conduction electron charge density. The additional terms are not so important for Li, Na and K and hence previous favourable agreement with observation is maintained. However, these terms are important for Rb and Cs and tend to improve the theoretical values, although significant discrepancies still remain.

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