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

For SiC (silicon monocarbide)

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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVTZ
Moller Plesset perturbation MP2=FULL -0.002560 -0.007146 -0.014306 -0.004840 -0.014991 -0.014991 -0.016251 -0.142187 -0.142187 -0.025918 -0.049336 -0.007854 -0.066562 -0.069903 -0.009136 -0.070449 -0.071732 -0.118433 -0.122298 -0.366015
MP3=FULL         -0.014703   -0.020753       -0.050148 -0.007477 -0.066560             -0.369851
MP4=FULL   -0.006982     -0.014870       -0.143408     -0.007586 -0.067963   -0.008892 -0.071921       -0.372159
B2PLYP=FULL -0.000902 -0.002271 -0.004511 -0.001536 -0.004634 -0.004634 -0.005020 -0.041585 -0.041585 -0.007944 -0.014675 -0.002478 -0.020053   -0.002872 -0.021157       -0.105551
Coupled Cluster CCSD=FULL         -0.014289           -0.049837 -0.007232 -0.065985 -0.070315 -0.008468 -0.069819 -0.072012     -0.367900
CCSD(T)=FULL         3.904948           -0.050753 -0.007506 -0.067421 -0.071761 -0.008778 -0.071254 -0.073482 -0.105832 -0.109157 -0.371513
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVTZ