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

For CH3NH2+ (methyl amine cation)

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 -0.000634 -0.003352 -0.003352 -0.002403 -0.007848 -0.008711 -0.008917 -0.037006 -0.037758 -0.016656 -0.034196 -0.005117 -0.030751 -0.058171 -0.005785 -0.035551 -0.059326
MP3=FULL         -0.007659   -0.008733       -0.035656 -0.004836 -0.031489        
MP4=FULL   -0.003213     -0.007677       -0.039210     -0.004813 -0.031685   -0.005476 -0.036890  
B2PLYP=FULL -0.000193 -0.001000 -0.001000 -0.000716 -0.002321 -0.002566 -0.002627 -0.010551 -0.010776 -0.004830 -0.009764 -0.001519 -0.008904   -0.001717 -0.010263  
Quadratic configuration interaction QCISD(T)=FULL         -0.007665             -0.004793 -0.031625   -0.005454 -0.036825  
QCISD(TQ)=FULL         -0.007666   -0.008721         -0.004788 -0.031618   -0.005448    
Coupled Cluster CCSD=FULL         -0.007576         -0.016754 -0.035587 -0.004722 -0.031329 -0.060278 -0.005375 -0.036506  
CCSD(T)=FULL         -0.007667           -0.035793 -0.004793 -0.031624 -0.060822 -0.005454 -0.036824  
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