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

For CH3MgBr (Methyl Magnesium Bromide)

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 daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.018797 -0.009022 -0.019448 -0.014864 -0.039459 -0.039998 -0.041338 -0.541167 -0.541561 -0.104095 -0.607219 -0.155381 -0.015023   -0.143139 -0.018549 -0.095883 -0.152523 -0.020066 -0.099593
MP4=FULL   -0.008841     -0.038696       -0.519861   -0.583890   -0.014524 -0.085044   -0.018085 -0.096497   -0.019622 -0.100265
B2PLYP=FULL -0.006279 -0.002895 -0.006157 -0.004511 -0.012243 -0.012397 -0.012810 -0.159612 -0.159733 -0.032202 -0.179346 -0.046707 -0.004739 -0.025858   -0.005837 -0.029053   -0.006317 -0.030142
Quadratic configuration interaction QCISD(T)=FULL         -0.038500           -0.576950   -0.014369 -0.083616   -0.017851 -0.094955   -0.019376 -0.098683
Coupled Cluster CCSD=FULL         -0.037616         -0.098081 -0.570923 -0.149372 -0.013775 -0.080985   -0.017115 -0.092187   -0.018583 -0.095869
CCSD(T)=FULL         -0.038470           -0.576727 -0.152254 -0.014354 -0.083492     -0.094815   -0.019345 -0.098540
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 daug-cc-pVDZ daug-cc-pVTZ