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(T)/6-311+G(3df,2p)

For ()
  Energy (hartrees)
frozen core -579.1500152
correlated core -579.4798387
difference -0.3298235
  Energy (hartrees)
frozen core -579.1834578
correlated core -579.5135934
difference -0.3301356
  Energy (hartrees)
frozen core -579.2104296
correlated core -579.5419845
difference -0.3315549
  Energy (hartrees)
frozen core -579.1951471
correlated core -579.5262758
difference -0.3311287