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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 GaCl+ atoms 1 and 2

For GaCl+ (Gallium monochloride 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 0.0010 0.0001 0.0011 0.0002 0.0101 0.0101 0.0107 0.0186 0.0186 0.0270 -0.0011 0.0008 0.0119 0.0134 0.0023 0.0098 0.0189
MP3=FULL         0.0096   0.0096       -0.0030 0.0011 0.0092        
MP4=FULL   0.0008     0.0101       0.0187     0.0016 0.0130   0.0023 0.0107  
B2PLYP=FULL 0.0010 0.0003 0.0004 0.0022 0.0061 0.0061 0.0060 0.0094 0.0094 0.0121 -0.0006 0.0006 0.0052   0.0008 0.0035  
Quadratic configuration interaction QCISD(T)=FULL         0.0102             0.0018 0.0117   0.0023 0.0095  
Coupled Cluster CCSD=FULL         0.0101         0.0284 -0.0018 0.0016 0.0114 0.0118 0.0023 0.0088 0.0169
CCSD(T)=FULL         0.0101           -0.0021 0.0011 0.0116 0.0117 0.0023 0.0094 0.0169
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

gaclq1.gif