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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+ (diatomic oxygen cation)
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         0.0731 0.0009 0.0010 0.0949 0.0013 0.0019 0.0005 0.0008 0.0050 0.0030 0.0010 0.0062 0.0031
MP3=FULL         -0.0235   0.0000       0.0003 0.0004 0.0026        
MP4=FULL         0.0010       0.0012     0.0007 0.0043   0.0008 0.0058  
B2PLYP=FULL 0.0000 0.0000 0.0000 0.0000 0.0002 0.0002 0.0002 0.0003 0.0003 0.0004 0.0001 0.0002 0.0647   0.0002 0.0013  
Coupled Cluster CCSD=FULL         0.0006           0.0004 0.0005 0.0031 0.0021 0.0006 0.0041 0.0022
CCSD(T)=FULL         0.0005           0.0003 0.0005 0.0032 0.0020 0.0006 0.0043 0.0021
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

o2q1.gif