The iterative-perturbative (IP) inversion algorithm makes it possible to deter-mine, essentially uniquely, the complex potential, including spin-orbit component, for spin half particles given the elastic scattering S-matrix Sy. We here report an extension of the method to the determination of energy dependent potentials V(r,E) defined over an energy range for which Sy(E) are provided. This is a natural development of the IP algorithm which has previously been applied to fixed energy, fixed partial wave and the interme-diate"mixedcase" inversion.Theenergyrangecanincludenegativeenergies, i.e. V(r, E) can reproduce bound state energies. It can also fit the effective range parameter for low energy scattering. We briefly define the classes of cases which can be studied, outline the IP method itself and briefly review the range of applications. We show the power of the method by presenting nucleon-a V(r,E) for Sj,(E) derived from experiments above and below the inelastic threshold and relating them to V(r,E) inverted from Sij(E) for RGM theory. Reference is given to the code IMAGO which embodies the IP algorithm.
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