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 MP2/6-31G**

For ()
  Energy (hartrees)
frozen core -579.0063795
correlated core -579.0283415
difference -0.0219621
  Energy (hartrees)
frozen core -579.0398042
correlated core -579.0619322
difference -0.0221279
  Energy (hartrees)
frozen core -579.0649642
correlated core -579.0875527
difference -0.0225885
  Energy (hartrees)
frozen core -579.0497923
correlated core -579.0721917
difference -0.0223994