Quantal and semiclassical (WKB) methods of inversion have been used in an analysis of the elastic-scattering cross sections for 62.5-meV He atoms from Ne atoms by which an effective local interaction between those atoms is specified. The potentials obtained by the approximate method (WKB) differ from that found with the full quantal analysis. The quantal inversion potential is repulsive at short distances and becomes attractive at a radius of 2.695 Å. It has a minimum value of -1.981 meV at a radius of 2.98 Å.

• Received 10 March 1994

DOI:https://doi.org/10.1103/PhysRevA.50.4025