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

For SiH+ (silicon monohydride 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
Moller Plesset perturbation MP2=FULL -0.002896 -0.005713 -0.012682 -0.003711 -0.010238 -0.010494 -0.011691 -0.124225 -0.124437 -0.018310 -0.033200 -0.005921 -0.054921 -0.044164 -0.006853 -0.057564 -0.045342
MP3=FULL         -0.010101   -0.012458       -0.033302 -0.005750 -0.054993        
MP4=FULL   -0.005578     -0.010173       -0.124888     -0.005815 -0.056176   -0.006755 -0.058842  
B2PLYP=FULL -0.000946 -0.001806 -0.003973 -0.001169 -0.003191 -0.003266 -0.003636 -0.036405 -0.036469 -0.005659 -0.010013 -0.001864 -0.016628   -0.002148 -0.017393  
Quadratic configuration interaction QCISD(T)=FULL         -0.010063             -0.005758 -0.055975   -0.006690 -0.058631  
QCISD(TQ)=FULL         -0.010063   -0.011558         -0.005748 -0.055862 -0.045152 -0.006677 -0.058517 -0.046304
Coupled Cluster CCSD=FULL         -0.009764         -0.017230 -0.033040 -0.005553 -0.054647 -0.043990 -0.006455 -0.057290 -0.045116
CCSD(T)=FULL         -0.010063           -0.033800 -0.005757 -0.055944 -0.045183 -0.006689 -0.058599 -0.046340
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