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Bond Length differences between FULL (all electrons correlated) and FROZEN core

Such as MP2=Frozen and MP2=Full
17 10 27 16 27

For O2 atoms 1 and 2

For O2 (Oxygen diatomic)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
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 Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ cc-pCVQZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ Sadlej_pVTZ
Moller Plesset perturbation MP2=FULL 0.0001 0.0001 0.0001 -0.0000 0.0010 0.0010 0.0010 0.0015 0.0015 0.0018 0.0028 0.0028 0.0006 0.0009 0.0007 0.0048 0.0030 0.0008 0.0067 0.0033 0.0008 0.0021 0.0023 0.0022 0.0007 0.0055 0.0006
MP3=FULL         0.0096   -0.0028           0.0005   0.0006 0.0033         0.0006 0.0016 0.0018 0.0016 0.0006 0.0044  
MP4=FULL 0.0001 -0.0002 -0.0001 -0.0000 0.0009 0.0007 0.0008 0.0012 0.0014 0.0014 0.0026 0.0026     0.0006 0.0047 0.0022 0.0008 0.0068 0.0024 0.0007 0.0015 0.0016 0.0016 0.0007 0.0057  
B2PLYP=FULL 0.0000 0.0000 0.0000 0.0000 0.0002 0.0002 0.0002 0.0003 0.0003 0.0004 0.0007   0.0001 0.0002 0.0002 0.0010   0.0002 0.0014   0.0002 0.0005 0.0006 0.0005 0.0002 0.0014  
Quadratic configuration interaction QCISD(T)=FULL         0.0007   0.0007               0.0005 0.0035 0.0021 0.0006 0.0050 0.0021 0.0007 0.0016     0.0007 0.0051  
Coupled Cluster CCSD=FULL 0.0001 0.0001 0.0001 0.0001 0.0007 0.0006 0.0007 0.0012 0.0011 0.0013 0.0025 0.0025 0.0005   0.0005 0.0037 0.0024 0.0007 0.0050 0.0025 0.0007 0.0018 0.0020 0.0019 0.0006 0.0048  
CCSD(T)=FULL 0.0001   0.0000 0.0000 0.0007 0.0006   0.0011 0.0010 0.0013 0.0025 0.0025 0.0004   0.0005 0.0039 0.0023 0.0007 0.0055 0.0025 0.0007 0.0017   0.0017 0.0006 0.0051  
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 Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ cc-pCVQZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ Sadlej_pVTZ

o2q1.gif