BORN-GREEN PAIR POTENTIALS FOR LIQUID LEAD

The k-space form of the Bom-Green (BG) equation has been investigated numerically. In particular, the equation has been used to derive the effective interatomic potential φBG from the measured structure factor S(k) for liquid Pb. These potentials are compared with those derived from another theory of liquids, namely, the Percus-Yevick theory (PY). It is found that φBG (like φpy) is very sensitive to the low-angle form of S(k); however, if the same input data are used for both theories, the resulting interatomic potentials are remarkably similar and are not like those derived from the pseudopotential theory of the metallic state.