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

For Si2H6 (disilane)

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 aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.007015 -0.011219 -0.024674 -0.007361 -0.020396 -0.022136 -0.024105 -0.247271 -0.248681 -0.039870 -0.327769 -0.066187 -0.014405 -0.119338 -0.095460 -0.018261 -0.129510 -0.102398 -0.082203 -0.219998 -0.230099 -0.408000 -0.636283 -0.637188 -0.018825 -0.133385
MP3=FULL         -0.019904   -0.027432       -0.326536 -0.066027 -0.013723 -0.119118         -0.082288 -0.221156 -0.231375 -0.411067 -0.641020 -0.641937 -0.018091 -0.133366
MP4=FULL   -0.010750     -0.020314       -0.249691   -0.330331   -0.014070 -0.121882   -0.017981 -0.132258   -0.083148 -0.225253 -0.235529 -0.412175 -0.645427 -0.646385 -0.018561 -0.136191
B2PLYP=FULL -0.002315 -0.003581 -0.007759 -0.002343 -0.006387 -0.006901 -0.007506 -0.072466 -0.072894 -0.012324 -0.096345 -0.020016 -0.004547 -0.036015   -0.005722 -0.038943   -0.024752 -0.065706 -0.068592 -0.118173 -0.183856 -0.184139 -0.005898 -0.040067
Quadratic configuration interaction QCISD(T)=FULL         -0.020283           -0.330130   -0.014022 -0.121683   -0.017910 -0.132047   -0.083082 -0.224930 -0.235190 -0.412054 -0.645124 -0.646070 -0.018490 -0.135983
QCISD(TQ)=FULL         -0.020242                     -0.016510                    
Coupled Cluster CCSD=FULL         -0.019749         -0.038660 -0.326688 -0.066177 -0.013569 -0.119400   -0.017362 -0.129756   -0.081913 -0.221308 -0.231536 -0.410268 -0.639499 -0.640398 -0.017924 -0.133695
CCSD(T)=FULL         -0.020285           -0.330073 -0.067512 -0.014020 -0.121619 -0.097919 -0.017904 -0.131981   -0.083063 -0.224809 -0.235067 -0.412039 -0.645072 -0.646017 -0.018483 -0.135917
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 aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ