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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 KH+ atoms 1 and 2

For KH+ (Potassium hydrogen 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 0.0025 0.0047 0.0128 0.0002 0.0410 0.0003 0.0003 0.0000 0.0059 0.0007 0.0098
MP3=FULL         -0.0443   0.0005        
Coupled Cluster CCSD(T)=FULL         0.0003           0.0101
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP

khq1.gif