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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For ClCOClCO (Oxalyl chloride)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.001124 -0.015805 -0.030813 -0.010335 -0.035791 -0.035791 -0.037879 -0.173278 -0.173278 -0.073427 -0.122851 -0.021337 -0.122793 -0.025674 -0.138098
MP3=FULL         -0.033435   -0.035462       -0.123034 -0.019035 -0.119832    
MP4=FULL   -0.014755     -0.033920       -0.175401     -0.019390 -0.121445    
B2PLYP=FULL -0.000341 -0.004752 -0.009239 -0.003103 -0.010656 -0.010656 -0.011275 -0.049648 -0.049648 -0.021605 -0.035456 -0.006397 -0.036085 -0.007685 -0.040415
Quadratic configuration interaction QCISD(T)=FULL         -0.033777             -0.019289 -0.121218    
Coupled Cluster CCSD=FULL         -0.033134         -0.068716 -0.122811 -0.018782 -0.119275    
CCSD(T)=FULL         -0.033777           -0.124181 -0.019286 -0.060249    
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ