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

For H2CNCH (methyleneaminomethylene)

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 -0.001043 -0.005135 -0.005135 -0.003864 -0.013310 -0.013821 -0.014343 -0.055861 -0.056310 -0.023928 -0.066684 -0.051228 -0.007413 -0.044610 -0.008536 -0.052744
MP3=FULL         -0.012992   -0.014040       -0.069084 -0.053393 -0.006938 -0.045635    
MP4=FULL   -0.004892     -0.013023       -0.058547   -0.069756   -0.006912 -0.045913 -0.008022 -0.054723
B2PLYP=FULL -0.000314 -0.001533 -0.001533 -0.001150 -0.003932 -0.004079 -0.004233 -0.015951 -0.016087 -0.006947 -0.019153 -0.014643 -0.002201 -0.012931 -0.002534 -0.015239
Quadratic configuration interaction QCISD(T)=FULL         -0.012957           -0.069556   -0.006856 -0.045738 -0.007956  
Coupled Cluster CCSD=FULL         -0.012805         -0.023733 -0.068803 -0.053270 -0.006748 -0.045293 -0.007835 -0.054062
CCSD(T)=FULL         -0.012966           -0.069536 -0.053638 -0.006859 -0.045745 -0.007959 -0.054544
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