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

For CH3CH(CH3)CN (Propanenitrile, 2-methyl-)

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 aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.001998 -0.008346 -0.008346 -0.006524 -0.022870 -0.024127 -0.024622 -0.093229 -0.094205 -0.044039 -0.085323 -0.012573 -0.076893 -0.014679 -0.091202
MP3=FULL             -0.024311       -0.089199 -0.011838 -0.079209    
MP4=FULL   -0.007987     -0.022604       -0.098240     -0.011800 -0.079586 -0.013893 -0.095079
B2PLYP=FULL -0.000605 -0.002494 -0.002494 -0.001948 -0.006770 -0.007131 -0.007277 -0.026665 -0.026958 -0.012809 -0.024432 -0.003748 -0.022337 -0.004372 -0.026392
Quadratic configuration interaction QCISD(T)=FULL         -0.022553             -0.011732 -0.079476 -0.013815  
Coupled Cluster CCSD=FULL         -0.022303           -0.089073 -0.011557 -0.078785 -0.013613  
CCSD(T)=FULL         -0.022563           -0.089642 -0.011735 -0.038107 -0.013817  
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 aug-cc-pVDZ aug-cc-pVTZ