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

For HOCHNH (hydroxymethylimine)

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
Moller Plesset perturbation MP2=FULL -0.000700 -0.005213 -0.005213 -0.003491 -0.010735 -0.011219 -0.011709 -0.056040 -0.056450 -0.023235 -0.067397 -0.051303 -0.007037 -0.042772 -0.087399 -0.008131 -0.049404 -0.088950
MP3=FULL         -0.010303   -0.011289       -0.069497 -0.053113 -0.006548 -0.043458        
MP4=FULL   -0.004925     -0.010336       -0.058178   -0.069942   -0.006516 -0.043565   -0.007605 -0.050696  
B2PLYP=FULL -0.000209 -0.001541 -0.001541 -0.001031 -0.003160 -0.003299 -0.003441 -0.015911 -0.016034 -0.006726 -0.019245 -0.014585 -0.002072 -0.012371   -0.002396 -0.014244  
Quadratic configuration interaction QCISD(T)=FULL         -0.010292           -0.069838   -0.006485 -0.043646   -0.007565 -0.050650  
Coupled Cluster CCSD=FULL         -0.010184         -0.023032 -0.069213 -0.052996 -0.006399 -0.043159 -0.090012 -0.007468 -0.050285 -0.091868
CCSD(T)=FULL         -0.010304           -0.069833 -0.053296 -0.006484 -0.043518 -0.090842 -0.007565 -0.050652 -0.061941
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