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 CCSD/6-31G(2df,p)

For ()
  Energy (hartrees)
frozen core -579.0853319
correlated core -579.1255706
difference -0.0402388
  Energy (hartrees)
frozen core -579.1177760
correlated core -579.1563564
difference -0.0385804
  Energy (hartrees)
frozen core -579.1495305
correlated core -579.1887580
difference -0.0392275
  Energy (hartrees)
frozen core -579.1313049
correlated core -579.1707946
difference -0.0394897