Crystal Potential Parameters from Fermi-Surface Dimensions

It is shown that Lee's nonunique phase-shift parameters ${\eta }_l\left(\kappa \right)$, determined from the experimental Fermi surfaces of Cu and the alkali metals, can be transformed into a unique set of parameters consisting of logarithmic derivatives $L_l$ at corresponding atomic radii $S_l$. The physical significance of these parameters is discussed and it is shown that they give direct information about the conduction electrons in the metal.