General second-order 1/Nformulas for the energy levels of spherically symmetric Hamiltonians relying on a novel fixing of the shifting parameter

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Abstract
General implicit formulas for the quick computation of the energy levels of spherically symmetric Schrödinger Hamiltonians have been written down to second 1/N order. This time the shifting parameter has been chosen, order by order, so that the sum of corrections to the zeroth-order energy evaluation vanishes, as proposed previously. Explicit second-order formulas for the energy levels of power potentials have also been given.