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

For OClO (Chlorine dioxide)

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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000299 -0.008003 -0.015662 -0.004832 -0.016263 -0.016263 -0.017498 -0.086942 -0.086942 -0.037178 -0.141791 -0.061891 -0.010679 -0.059375 -0.122991 -0.012896 -0.064721 -0.125021 -0.061884 -0.129798 -0.135077 -0.287725 -0.441504 -0.013770 -0.067384
MP3=FULL         -0.015069   -0.031222                       -0.059686 -0.127529 -0.133007 -0.289814 -0.443006    
MP4=FULL                                     -0.059976 -0.128806 -0.134236 -0.290460 -0.445963    
B2PLYP=FULL -0.000091 -0.002397 -0.004683 -0.001444 -0.004810 -0.004810 -0.005173 -0.024805 -0.024805 -0.010926 -0.040832 -0.017766 -0.003168 -0.017384   -0.003818 -0.018897   -0.018059 -0.037754 -0.039244 -0.081488 -0.125278 -0.004076 -0.019656
Quadratic configuration interaction QCISD(T)=FULL         -0.015053           -0.141747   -0.009574 -0.058173   -0.011703 -0.063636   -0.059775 -0.128370 -0.133786 -0.290158 -0.445008 -0.012547 -0.066373
Coupled Cluster CCSD=FULL         -0.014843         -0.035135 -0.140204 -0.061424 -0.009397 -0.057301 -0.122145 -0.011523 -0.062761 -0.124181 -0.059202 -0.126931 -0.132342 -0.288814 -0.441586 -0.012351 -0.065460
CCSD(T)=FULL         -0.015106           -0.141768 -0.062123 -0.009616 -0.058233 -0.123870 -0.011754 -0.063706 -0.125910 -0.059794 -0.128392 -0.133819 -0.290171 -0.444959 -0.012599 -0.066441
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ