Modified Interionic Potential for the Alkali Metals

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Abstract
The presence of the conduction electrons in a metal necessarily modifies the interionic potential. Within the framework of perturbation theory, the modified ion-ion interaction can be described by a pairwise central interaction between ions. Using the recent form factors of the model pseudopotential and a modified Hartree dielectric function, we have calculated the modified interionic potential for all the alkali metals. The potential is found to be long-range and oscillatory, particularly for lithium metal. The modified interionic potential is further analyzed through the interatomic force constants and elastic constants, and is compared with experiment whenever possible. Generally good agreement is achieved.

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