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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 FO atoms 1 and 2

For FO (Oxygen monofluoride)
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) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.0000 -0.0000 -0.0000 -0.0000 0.0034 0.0000 0.0001 -0.1686 0.0000 0.0010 0.0004 -0.0000 0.0022 0.0002 0.0000 0.0034 0.0003
MP3=FULL         -0.0003   -0.0030       0.0005 0.0002 0.0027        
MP4=FULL   0.0000     0.1482       0.0006     0.0002 0.0022   0.0003 0.0032  
B2PLYP=FULL 0.0000 0.0121 0.0000 0.0000 0.0094 0.0002 0.0132 0.0002 -0.0001 0.0004 0.0002 0.0001 0.0009   0.0001 0.0012  
Quadratic configuration interaction QCISD(T)=FULL         0.0008             0.0002 0.0036   0.0005 0.0051  
Coupled Cluster CCSD=FULL         -0.0128         0.0056 0.0009 0.0003 0.0035 0.0022 0.0006 0.0051 0.0030
CCSD(T)=FULL         0.0006           0.0007 0.0001 0.0037 0.0023 0.0004 0.0047 0.0028
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

foq1.gif