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

For CH3PH3+ (methyl phosphine, protonated)

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) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.002682 -0.007494 -0.014615 -0.004955 -0.015605 -0.017262 -0.017920 -0.142016 -0.143086 -0.029173 -0.047371 -0.011195 -0.061930 -0.082442 -0.013360 -0.069511 -0.085138
MP3=FULL         -0.015161   -0.017458       -0.047815 -0.010566 -0.061863        
MP4=FULL   -0.007130     -0.015356       -0.144065     -0.010734 -0.062982   -0.012908 -0.070895  
B2PLYP=FULL -0.000857 -0.002320 -0.004497 -0.001529 -0.004744 -0.005225 -0.005424 -0.041203 -0.041525 -0.008783 -0.013957 -0.003426 -0.018417   -0.004080 -0.020592  
Quadratic configuration interaction QCISD(T)=FULL         -0.015315             -0.010685 -0.062856   -0.012855 -0.070757  
Coupled Cluster CCSD=FULL         -0.015007         -0.028236 -0.047766 -0.010407 -0.061772 -0.083432 -0.012531 -0.069624 -0.086072
CCSD(T)=FULL         -0.015317           -0.048450 -0.010683 -0.062839 -0.084814 -0.012853 -0.070738 -0.070936
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ