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

For CH2CCH2 (allene)

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 cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ Sadlej_pVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.001293 -0.004921 -0.004921 -0.003950 -0.014389 -0.015081 -0.015323 -0.055560 -0.056105 -0.021620 -0.065827 -0.050818 -0.007505 -0.045876 -0.083955 -0.008297 -0.054291 -0.085958   -0.105517 -0.142699 -0.045478 -0.008540 -0.055831
MP3=FULL         -0.014245   -0.022711                                  
B2PLYP=FULL -0.000391 -0.001478 -0.001478 -0.001183 -0.004273 -0.004472 -0.004544 -0.015930 -0.016095 -0.006355 -0.018998 -0.014578 -0.002249 -0.013364   -0.002486 -0.015758           -0.002558 -0.016196
Quadratic configuration interaction QCISD(T)=FULL         -0.014259           -0.069167   -0.007037 -0.047565   -0.007832 -0.056696           -0.008073 -0.058372
Coupled Cluster CCSD=FULL         -0.014083         -0.021463 -0.068431 -0.053222 -0.006923 -0.047147 -0.087497 -0.007707 -0.056236           -0.007944 -0.057885
CCSD(T)=FULL         -0.014265           -0.069150 -0.053589 -0.007038 -0.047565 -0.088401 -0.007833 -0.056695 -0.090516 -0.047565 -0.111858 -0.149337   -0.008074 -0.058369
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 cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ Sadlej_pVTZ daug-cc-pVDZ daug-cc-pVTZ