Strong-coupling expansion for energy eigenvalues

A simple method is presented to expand the eigenvalues Esub(nl)() for a central potential V(r), with Coulomb behaviour at the origin, as a power series in 1/g. The rational approximants to such series may provide accurate estimates of Esub(nl)(). We illustrate of this strong-coupling expansion method for the Yukawa potential. As shown, the technique herein developed works extraordinarily well in this typical example