Tables of Coefficients to Determine the Long-Range Contributions to Low-Energy Electron-Atom Scattering

The difficulty in the extrapolation or interpolation in energy of the phase shifts deduced from electron-atom scattering data stems from the presence of an effective one-body long-range potential $U\left(r\right)\mathrm{}$. $U\left(r\right)\mathrm{}$ has its origin in the static and dynamic polarizabilities of the atom, assumed to have a spherically symmetric ground state, and gives rise to an unusual and rapidly varying energy dependence.