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

For Si+ (Silicon 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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL                     -0.164895 -0.164895 -0.033052         -0.054770  
MP3=FULL         -0.010143   -0.011380                        
MP4=FULL -0.002232 -0.005561 -0.012788 -0.003530 -0.010193 -0.010193 -0.011462 -0.124820 -0.124820 -0.017618 -0.165672 -0.165672 -0.033856 -0.005350 -0.054864 -0.044053 -0.005886 -0.056130 -0.044265
Coupled Cluster CCSD=FULL -0.002154 -0.005354 -0.012336 -0.003399 -0.009828 -0.009828 -0.011061 -0.123717 -0.123717 -0.016912 -0.163417 -0.163417 -0.033020 -0.005129 -0.053463 -0.042723 -0.005643 -0.054692 -0.042926
CCSD(T)=FULL -0.002202 -0.005510 -0.012654 -0.003491   -0.010065 -0.011329 -0.124665 -0.124665 -0.017363 -0.165248 -0.165248 -0.033689            
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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ