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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 KO+ atoms 1 and 2

For KO+ (Potassium monoxide 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
Moller Plesset perturbation MP2=FULL -0.0007 0.0227 0.0211 0.0003 0.4992 0.0024 0.0024 0.5155 0.0070 0.0021 0.0845
MP3=FULL         0.0024   0.0023       0.0949
MP4=FULL   0.0259     0.0024       0.0066    
B2PLYP=FULL -0.0002 0.0104 0.0086 0.0001 0.0007 0.0007 0.0007 0.0020 0.0020 0.0006 0.0266
Quadratic configuration interaction QCISD(T)=FULL         0.0023            
Coupled Cluster CCSD=FULL         0.0027           0.0953
CCSD(T)=FULL         0.0023           0.0970
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP

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