It is difficult, if not impossible, to extrapolate the helium pair potential to the limit of a complete basis to within the accuracy needed to improve significantly on existing, directly computed potentials. Even though the basis-set convergence of calculations in a correlation-consistent basis with cardinal number X is dominated by the term, it is important to account for energy terms that converge more rapidly than The electron-correlation contribution to the potential will be overestimated noticeably when these terms are not properly taken into account.
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