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

For SO2 (Sulfur 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) 6-311+G(3df,2pd) 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 Sadlej_pVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000958 -0.009093 -0.017093 -0.005549 -0.017619 -0.017619 -0.018978 -0.157870 -0.157870 -0.039242 -0.211826 -0.211826 -0.063265 -0.011714 -0.061434 -0.119452 -0.014371 -0.067419 -0.121271 -0.058223 -0.126116 -0.132021 -0.284691 -0.354610 -0.434754 -0.072401 -0.015278 -0.070651
MP3=FULL         -0.016672   -0.018015                           -0.125094 -0.131260   -0.354681 -0.437649      
MP4=FULL -0.000628 -0.008272 -0.016213 -0.004919 -0.016608 -0.016608 -0.017953 -0.158086 -0.158086 -0.038369 -0.212587 -0.212587 -0.063769 -0.010703 -0.060892   -0.013311 -0.067000     -0.126334 -0.132385   -0.357218 -0.440708      
B2PLYP=FULL -0.000295 -0.002734 -0.005152 -0.001661 -0.005272 -0.005272 -0.005678 -0.045259 -0.045259 -0.011654 -0.061085   -0.018238 -0.003514 -0.018103   -0.004320 -0.019827     -0.036938 -0.038632   -0.101452 -0.123831   -0.004590 -0.020750
Quadratic configuration interaction QCISD(T)=FULL         -0.016671   -0.018026       -0.212106     -0.010790 -0.060942   -0.013464 -0.067123     -0.126032 -0.132138   -0.356430 -0.439814   -0.014365 -0.070420
Coupled Cluster CCSD=FULL -0.000625 -0.008058 -0.015867 -0.004781 -0.016392 -0.016392 -0.017723 -0.156851 -0.156851 -0.037705 -0.210052 -0.210052 -0.063097 -0.010589 -0.060024 -0.119518 -0.013255 -0.066215 -0.121391   -0.124502 -0.130607   -0.353448 -0.436214   -0.014142 -0.069474
CCSD(T)=FULL -0.000664 -0.008328 -0.016251 -0.004958 -0.016708 -0.016708 -0.018064 -0.157934 -0.157934 -0.038318 -0.212094 -0.212094 -0.063829 -0.010825 -0.060999 -0.121266 -0.013507 -0.067187 -0.123135 -0.057098 -0.126038 -0.132152 -0.287995 -0.439102 -0.439760   -0.014409 -0.070482
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) 6-311+G(3df,2pd) 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 Sadlej_pVTZ daug-cc-pVDZ daug-cc-pVTZ