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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)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
Methods with standard basis sets
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 0.0018 0.0034 0.0154 0.0154 0.0169 0.0260 0.0273 0.0446 -0.0008 0.0025 0.0193 0.0175 0.0041 0.0162 0.0261
MP4=FULL 0.0011     0.0153       0.0279     0.0026 0.0189   0.0042 0.0168  
Coupled Cluster CCSD=FULL       0.0136           -0.0019 0.0021 0.0148 0.0128 0.0035 0.0136 0.0208
CCSD(T)=FULL       0.0150           -0.0018 0.0023 0.0160 0.0135 0.0039 0.0142 0.0208
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