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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 Ga2 atoms 1 and 2

For Ga2 (Gallium diatomic)
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   0.0048 0.0131 0.0158 0.0328 0.0328 0.0330 0.0533 0.0533 0.1472 0.0017 0.0130 0.0446 0.0201 0.0138 0.0473 0.0349
MP3=FULL         0.0271   0.0269       -0.0090 0.0105 0.0276        
MP4=FULL   0.0050     0.0330       0.0535     0.0136 0.0444   0.0151 0.0455  
B2PLYP=FULL 0.0016 0.0033 0.0046 0.0072 0.0131 0.0131 0.0132 0.0197 0.0197 0.0548 0.0006 0.0048 0.0134   0.0049 0.0152  
Quadratic configuration interaction QCISD(T)=FULL         0.0317             0.0132 0.0357   0.0146 0.0379  
Coupled Cluster CCSD=FULL         0.0287         0.1321 -0.0042 0.0118 0.0337 0.0109 0.0121 0.0370 0.0225
CCSD(T)=FULL         0.0312           -0.0042 0.0131 0.0356 0.0112 0.0138 0.0379 0.0236
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

ga2.gif