The authors compute helium-like S-state energies with a Lagrange mesh and fit a 9-parameter Pade-type formula to them, claiming 10-14 digit accuracy.
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Helium-like ions $(Z,e,e)$ in Lagrange Mesh method, interpolating the highly-accurate energy spectra vs. Z
The authors compute helium-like S-state energies with a Lagrange mesh and fit a 9-parameter Pade-type formula to them, claiming 10-14 digit accuracy.