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

For C6H6 (Dewar Benzene)

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) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.002706 -0.010071 -0.010071 -0.008147 -0.029424 -0.030444 -0.031026 -0.112189 -0.113132 -0.050126 -0.132928 -0.102187 -0.014833 -0.093067 -0.017760 -0.111531 -0.018218 -0.114397
MP3=FULL         -0.029055   -0.030681       -0.138212 -0.107009 -0.013924 -0.095885     -0.017267  
MP4=FULL                               -0.114928   -0.119939
B2PLYP=FULL -0.000821 -0.003021 -0.003021 -0.002438 -0.008707 -0.009000 -0.009173 -0.032145 -0.032431 -0.014597 -0.038288 -0.029309 -0.004436 -0.027058 -0.005302 -0.032294 -0.005437 -0.033112
Quadratic configuration interaction QCISD(T)=FULL                             -0.016723 -0.116363 -0.036189 -0.120021
Coupled Cluster CCSD=FULL         -0.028756         -0.050178 -0.137887 -0.106883 -0.013616 -0.095497 -0.016466 -0.115378 -0.016911  
CCSD(T)=FULL                     -0.129290         -0.062661   -0.042534
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ daug-cc-pVDZ daug-cc-pVTZ