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

For CH3N3 (methyl azide)

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 -0.001069 -0.007004 -0.007004 -0.004864 -0.015062 -0.015599 -0.016423 -0.074934 -0.075359 -0.033844 -0.068648 -0.009608 -0.057569 -0.010885 -0.067927
MP3=FULL         -0.014525   -0.015897       -0.071202 -0.008971 -0.058900    
MP4=FULL   -0.006630     -0.014466       -0.077853     -0.008877 -0.058823 -0.010145 -0.069933
B2PLYP=FULL -0.000320 -0.002081 -0.002081 -0.001441 -0.004448 -0.004602 -0.004842 -0.021330 -0.021458 -0.009818 -0.019561 -0.002846 -0.016721 -0.003226 -0.019660
Quadratic configuration interaction QCISD(T)=FULL         -0.014456             -0.008849 -0.058872 -0.010113 -0.070016
Coupled Cluster CCSD=FULL         -0.014314         -0.034064 -0.071027 -0.008739 -0.058425 -0.009987 -0.069573
CCSD(T)=FULL         -0.014469           -0.071469 -0.008856 -0.058888 -0.010118 -0.070034
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