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

For GeCl (Germanium monochloride)

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 -0.000650 -0.007870 -0.022029 -0.015316 -0.039810 -0.039810 -0.041286 -0.442144 -0.442144 -0.112242 -0.535953 -0.166324 -0.014709 -0.092363 -0.137210 -0.017404 -0.098351 -0.140532 -0.018312 -0.102023
MP3=FULL         -0.038056   -0.060824                          
B2PLYP=FULL -0.000327 -0.002413 -0.006806 -0.004723 -0.012989 -0.012989 -0.013435 -0.133148 -0.133148 -0.036250 -0.161058 -0.049903 -0.004635 -0.028143   -0.005462 -0.029887   -0.005742 -0.030941
Quadratic configuration interaction QCISD(T)=FULL         -0.039839           -0.500712   -0.013731 -0.086787   -0.016359 -0.092303   -0.017230 -0.095671
Coupled Cluster CCSD=FULL         -0.038450         -0.104629 -0.492623 -0.146459 -0.013038 -0.083555 -0.125168 -0.015537 -0.089025 -0.128036 -0.016371 -0.092394
CCSD(T)=FULL         -0.039786           -0.500247 -0.149132 -0.013710 -0.086564 -0.128652 -0.016325 -0.092075 -0.131561 -0.017192 -0.095444
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