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

For BP (Boron monophosphide)

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 -0.001673 -0.006971 -0.014409 -0.004641 -0.015588 -0.015588 -0.016447 -0.140990 -0.140990 -0.026210 -0.045049 -0.008141 -0.052038 -0.075458 -0.009317 -0.056700 -0.076279
MP3=FULL         -0.015130   -0.015985       -0.045687 -0.007559 -0.051586        
MP4=FULL   -0.006741     -0.015346       -0.142135     -0.007715 -0.052657   -0.008896 -0.057543  
B2PLYP=FULL -0.000555 -0.002178 -0.004456 -0.001447 -0.004737 -0.004737 -0.005000 -0.040973 -0.040973 -0.007891 -0.013322 -0.002516 -0.015565   -0.002867 -0.016859  
Quadratic configuration interaction QCISD(T)=FULL         -0.015152             -0.007595 -0.052150   -0.008745 -0.056863  
QCISD(TQ)=FULL         -0.015070   -0.015943         -0.007516 -0.051910 -0.077078 -0.008651 -0.056605 -0.077877
Coupled Cluster CCSD=FULL         -0.014783         -0.024345 -0.045500 -0.007321 -0.051025 -0.075829 -0.008439 -0.055774 -0.076623
CCSD(T)=FULL         -0.015144           -0.046261 -0.007584 -0.052133 -0.077294 -0.008733 -0.056868 -0.078099
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