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

For C3H6O3 (1,3,5-Trioxane)

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
Moller Plesset perturbation MP2=FULL -0.001582 -0.010588 -0.010588 -0.007370 -0.023112 -0.024162 -0.025304 -0.112292 -0.113244 -0.047514 -0.135598 -0.102862 -0.014583 -0.087886 -0.174792 -0.017784 -0.102391 -0.178798
MP3=FULL         -0.022377   -0.045536       -0.139906 -0.106579 -0.013645 -0.089444        
MP4=FULL   -0.010049     -0.022502       -0.116837   -0.140704   -0.013607 -0.089738   -0.016773 -0.105296  
B2PLYP=FULL -0.000472 -0.003113 -0.003130 -0.002177 -0.006795 -0.007095 -0.007426 -0.031875   -0.013732 -0.038676 -0.029243 -0.004287 -0.025354   -0.005234 -0.029449  
Quadratic configuration interaction QCISD(T)=FULL         -0.022350           -0.140517   -0.013519 -0.089678        
Coupled Cluster CCSD=FULL         -0.022152         -0.047324 -0.139616 -0.106348 -0.013350 -0.089008     -0.104110  
CCSD(T)=FULL         -0.022407           -0.140516 -0.144746 -0.013522 -0.089629 -0.180077 -0.016674 -0.104481  
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