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

For SiF+ (silicon monofluoride 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) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z cc-pCVTZ aug-cc-pCVTZ
Moller Plesset perturbation MP2=FULL -0.002782 -0.007854 -0.015083 -0.005075 -0.013437 -0.013437 -0.015123 -0.143166 -0.143166 -0.027070 -0.050542 -0.008368 -0.068067 -0.075568 -0.009667 -0.071963 -0.077816 -0.119969 -0.373758 -0.374308
MP3=FULL         -0.013063   -0.022052       -0.050921 -0.008020 -0.067979         -0.120412 -0.377153 -0.377707
MP4=FULL   -0.007536     -0.013211       -0.143819     -0.008072 -0.069184   -0.009407 -0.073152   -0.122140 -0.379264 -0.379810
B2PLYP=FULL -0.000908 -0.002425 -0.004667 -0.001563 -0.004117 -0.004117 -0.004626 -0.041705 -0.041705 -0.008234 -0.014871 -0.002566 -0.020369   -0.002960 -0.021493   -0.035716 -0.107501 -0.107671
Quadratic configuration interaction QCISD(T)=FULL         -0.013075             -0.008009 -0.068985   -0.009338 -0.072963   -0.121647 -0.378783 -0.379336
QCISD(TQ)=FULL         -0.013085   -0.014801         -0.008024 -0.068924 -0.077316 -0.009345 -0.072913 -0.079566      
Coupled Cluster CCSD=FULL         -0.012747         -0.025950 -0.050648 -0.007803 -0.067640 -0.075973 -0.009092 -0.071615 -0.078184 -0.119585 -0.375330 -0.375861
CCSD(T)=FULL         -0.013080           -0.051447 -0.008018 -0.068974 -0.077301 -0.009344 -0.072954 -0.079550 -0.121597 -0.378766 -0.379322
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 cc-pCVTZ aug-cc-pCVTZ