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

For C4H2N2 (Fumaronitrile)

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 -0.002063 -0.010001 -0.010001 -0.007583 -0.026682 -0.027029 -0.027865 -0.112043 -0.112344 -0.049631 -0.102062 -0.013985 -0.087982 -0.016363 -0.104205
MP3=FULL         -0.026234   -0.027443       -0.106536 -0.013112 -0.090578    
MP4=FULL   -0.009547     -0.026249       -0.116970     -0.013066 -0.090811 -0.015430 -0.108333
B2PLYP=FULL -0.000627 -0.002989 -0.002989 -0.002264 -0.007921 -0.008021 -0.008269 -0.032046 -0.032137 -0.014539 -0.029204 -0.004183 -0.025657 -0.004891 -0.030267
Quadratic configuration interaction QCISD(T)=FULL         -0.026190             -0.012989 -0.090741 -0.015343 -0.108317
Coupled Cluster CCSD=FULL         -0.025877           -0.106323 -0.012775 -0.089926 -0.015101 -0.107520
CCSD(T)=FULL         -0.026206           -0.107041 -0.012995 -0.090755 -0.015349 -0.108333
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