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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- (flourine oxide anion)
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) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL 0.0000 0.0000 0.0000 0.0000 -0.1195 0.0005 0.0007 -0.1227 0.0008 0.0008 0.0002 0.0028 0.0016 0.0005 0.0029
MP3=FULL         0.1188   0.0000                
Coupled Cluster CCSD(T)=FULL         0.0006               0.0026   0.0031
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVQZ

foq1.gif