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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 GaH+ atoms 1 and 2

For GaH+ (Gallium monohydride 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 0.0014 0.0008 -0.0006 0.0002 -0.0012 0.0079 0.0078 0.0041 0.0172 0.0075 -0.0008 0.0009 0.0080 0.0192 0.0051 0.0147 0.0296
MP3=FULL         -0.0031   0.0068       -0.0033 0.0007 0.0060        
MP4=FULL   0.0013     -0.0042       0.0170     0.0012 0.0103   0.0057 0.0154  
B2PLYP=FULL 0.0014 0.0006 -0.0001 0.0006 -0.0006 0.0027 0.0027 0.0019 0.0069 0.0035 -0.0005 0.0004 0.0059   0.0024 0.0071  
Quadratic configuration interaction QCISD(T)=FULL         -0.0048             0.0012 0.0101   0.0064 0.0147  
Coupled Cluster CCSD=FULL         -0.0033         0.0102 -0.0006 0.0014 0.0098 0.0218 0.0064 0.0147 0.0321
CCSD(T)=FULL         -0.0047           -0.0021 0.0012 0.0101 0.0213 0.0065 0.0147 0.0324
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

gahq1.gif