Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 115, Issue 2, Pages 761-765Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1379577
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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 X-3 term, it is important to account for energy terms that converge more rapidly than proportional toX(-3). The electron-correlation contribution to the potential will be overestimated noticeably when these terms are not properly taken into account. (C) 2001 American Institute of Physics.
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