Effect of three-body forces on the lattice dynamics of noble metals

A simple method to generate an effective electron-ion interaction pseudopot ential From the energy wave number characteristic obtained by first princip les calculations has been suggested. This effective potential has been used , in third order perturbation, to study tile effect of three-body forces on the lattice dynamics of noble metals. It is found that three-body forces, in these metals, do play;In important role. The inclusion of such three-bod y forces appreciably improves the agreement between the experimental and th eoretical phonon dispersion curves.