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

For CHNHCH (1H-Azirine)

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 -0.001036 -0.005013 -0.005013 -0.003754 -0.012778 -0.013287 -0.013694 -0.055710 -0.056248 -0.022469 -0.066236 -0.051074 -0.007086 -0.043840 -0.008230 -0.051190
MP3=FULL         -0.012502   -0.013435       -0.068762 -0.053287 -0.006644 -0.045010    
MP4=FULL   -0.004761     -0.012513       -0.058494   -0.069314   -0.006596 -0.045148 -0.007728 -0.053061
B2PLYP=FULL -0.000311 -0.001496 -0.001496 -0.001118 -0.003779 -0.003925 -0.004046 -0.015910 -0.016074 -0.006557 -0.019032 -0.014600 -0.002110 -0.012754 -0.002452 -0.014838
Quadratic configuration interaction QCISD(T)=FULL         -0.012476           -0.069179   -0.006555 -0.045078 -0.007683 -0.052994
Coupled Cluster CCSD=FULL         -0.012332         -0.022416 -0.068498 -0.053159 -0.006464 -0.044716 -0.007580  
CCSD(T)=FULL         -0.012484           -0.069170 -0.053511 -0.006558 -0.045086 -0.007686 -0.053003
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