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

For CHFCHClz ((Z)-1-Chloro-2-fluoroethene)

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 aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000935 -0.009542 -0.017032 -0.006417 -0.022093 -0.022452 -0.023623 -0.105117 -0.105447 -0.041079 -0.163356 -0.078238 -0.013156 -0.077078 -0.015456 -0.086871
MP3=FULL         -0.020869   -0.022377       -0.162576 -0.079028 -0.011871 -0.075927    
MP4=FULL   -0.008929     -0.021155       -0.107234   -0.164457   -0.012062 -0.076939 -0.014344 -0.087266
B2PLYP=FULL -0.000284 -0.002862 -0.005101 -0.001922 -0.006570 -0.006673 -0.007016 -0.030085 -0.030184 -0.012104 -0.047110 -0.022517 -0.003934 -0.022569 -0.004620 -0.025340
Quadratic configuration interaction QCISD(T)=FULL         -0.021060           -0.164104   -0.011988 -0.076745 -0.014245  
Coupled Cluster CCSD=FULL         -0.020691         -0.038458 -0.162271 -0.078921 -0.011703 -0.075629 -0.013908 -0.085901
CCSD(T)=FULL         -0.021058           -0.164071 -0.079693 -0.011984 -0.076730 -0.014235  
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 aug-cc-pVDZ aug-cc-pVTZ