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

For C2ClF3 (Ethene, chlorotrifluoro-)

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
Moller Plesset perturbation MP2=FULL -0.000973 -0.013354 -0.020857 -0.008654 -0.027542 -0.027542 -0.029594 -0.143413 -0.143413 -0.054277 -0.211542 -0.112563 -0.017312 -0.102171 -0.020864 -0.115489
MP4=FULL   -0.012421     -0.026269       -0.145518   -0.213459   -0.015861 -0.101548 -0.019383  
B2PLYP=FULL -0.000293 -0.003966 -0.006209 -0.002569 -0.008145 -0.008145 -0.008740 -0.040817 -0.040817 -0.015870 -0.060663 -0.032145 -0.005126 -0.029724 -0.006177 -0.033481
Quadratic configuration interaction QCISD(T)=FULL         -0.026123           -0.213085   -0.015761 -0.101352 -0.019251  
Coupled Cluster CCSD=FULL         -0.025706         -0.051364 -0.210936 -0.113712 -0.015440 -0.100064 -0.018870 -0.114078
CCSD(T)=FULL         -0.026123           -0.213060 -0.114631 -0.015757 -0.101350 -0.019243 -0.115379
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