Computation of the second-order correlation energies of Ne using a finite-element method

A p-version finite-element method is applied within the Moller-Plesset formalism [Phys. Rev. 46, 618 (1934)] to calculate accurate second-order pair and total correlation energies. Radial limits of the second-order correlation energy up to l=12 are given, and careful angular-extrapolation procedures have been applied to obtain results which are expected to be accurate to ±2×${10}^{\mathrm{-}5}$ hartree.