National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 22May 2022
NIST Standard Reference Database 101
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III.G.10.a.

Energy differences between frozen core and full core for MP2/6-311+G(3df,2p)

For ()
  Energy (hartrees)
frozen core -579.1048996
correlated core -579.4331830
difference -0.3282834
  Energy (hartrees)
frozen core -579.1347261
correlated core -579.4644273
difference -0.3297012
  Energy (hartrees)
frozen core -579.1639908
correlated core -579.4951540
difference -0.3311632
  Energy (hartrees)
frozen core -579.1490070
correlated core -579.4793755
difference -0.3303685