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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 ScO atoms 1 and 2

For ScO (Scandium monoxide)
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 -0.0004 -0.0011 -0.0011 -0.0026 0.0237 0.0177 0.0167 0.0145 0.0134 0.0336 0.0098 0.0114 0.0278 0.0397 0.0211 0.0365 0.0433
MP3=FULL         0.0096   0.0086       0.0031 0.0045 0.0197        
MP4=FULL   0.0015     0.0143       -0.0081     0.0064 0.0157   0.0179 0.0278  
B2PLYP=FULL -0.0002 -0.0004 -0.0004 -0.0009 0.0049 0.0049 0.0041 0.0031 0.0031 0.0093 0.0023 0.0029 0.0068   0.0059 0.0094  
Quadratic configuration interaction QCISD(T)=FULL         0.0157             0.0105 0.0219   0.0208 0.0314  
Coupled Cluster CCSD=FULL         0.0114           0.0046 0.0062 0.0197 0.0299 0.0151 0.0277 0.0335
CCSD(T)=FULL         0.0145           0.0080 0.0092 0.0222 0.0322 0.0191 0.0310 0.0360
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

sco.gif