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 MP4/6-31G*

For ()
  Energy (hartrees)
frozen core -225.1136235
correlated core -225.1202579
difference -0.0066344
  Energy (hartrees)
frozen core -225.1124212
correlated core -225.1202579
difference -0.0078367
  Energy (hartrees)
frozen core -225.1136235
correlated core -225.1190374
difference -0.0054139
  Energy (hartrees)
frozen core -225.1124212
correlated core -225.1190374
difference -0.0066162
  Energy (hartrees)
frozen core -225.1136241
correlated core -225.1202584
difference -0.0066343