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

For Se+ (Selenium atom 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) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000057 -0.003251 -0.009751 -0.010765 -0.128312 -0.029306 -0.029965 -0.473812 -0.375234 -0.090018 -0.417441 -0.068799 -0.008310 -0.046182 -0.082202 -0.009935 0.044028 -0.082994 -0.010339 -0.049081
MP3=FULL         0.067891   -0.044964       -0.372018 -0.056977 -0.007479 -0.039817         -0.009295 -0.042354
MP4=FULL   -0.003201     -0.029347       -0.356360   -0.395916   -0.008050 -0.044614   -0.009661 -0.046826   -0.010057 -0.047399
B2PLYP=FULL -0.000020 0.080013 -0.003016 -0.003178 0.073252 -0.009140 0.073186 -0.110871 -0.110871 -0.028137 -0.123351 -0.020629 -0.002602 -0.092718   -0.003098 -0.014713   -0.003221 -0.014889
Quadratic configuration interaction QCISD(T)=FULL         -0.029141           -0.388741   -0.007935 -0.043091   -0.009513 -0.045218   -0.009899 -0.045775
Coupled Cluster CCSD=FULL         -0.028486         -0.084725 -0.384347 -0.060045 -0.007578 -0.041418 -0.073299 -0.009081 -0.043514 -0.074032 -0.009451 -0.044065
CCSD(T)=FULL         -0.029115           -0.388525 -0.061832 -0.007924 -0.042990 -0.075261 -0.009497 -0.045114 -0.076000 -0.009883 -0.045670
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 daug-cc-pVDZ daug-cc-pVTZ