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

For HClO3 (Chloric Acid)

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-pCVTZ
Moller Plesset perturbation MP2=FULL -0.000450 -0.010033 -0.017847 -0.006121 -0.019747 -0.019880 -0.021330 -0.106407 -0.106525 -0.046221 -0.166409 -0.079734 -0.013491 -0.074302 -0.154080 -0.016513 -0.082295 -0.156912 0.001282 -0.493568
MP3=FULL         -0.018366   -0.019928       -0.166288 -0.080003 -0.012209 -0.072779         -0.373863 -0.496682
MP4=FULL         -0.018318       -0.107229   -0.167459   -0.012177 -0.073218   -0.015047 -0.081467     -0.500087
B2PLYP=FULL   -0.002991 -0.005316 -0.001817 -0.005800 -0.005840 -0.006266 -0.030268 -0.030304 -0.013506 -0.047779 -0.022787 -0.003967 -0.021625   -0.004848 -0.023894   -0.106813 -0.139917
Quadratic configuration interaction QCISD(T)=FULL         -0.018251           -0.167154   -0.012101 -0.073075   -0.014968 -0.081430     -0.498987
Coupled Cluster CCSD=FULL         -0.018047         -0.044220 -0.165485 -0.079625 -0.011915 -0.072136   -0.014823 -0.080447   -0.372448 -0.495088
CCSD(T)=FULL         -0.018311           -0.167237 -0.080375 -0.012149 -0.073155 -0.155934 -0.015039 -0.081527   -0.375388 -0.498921
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-pCVTZ