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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 ScF atoms 1 and 2

For ScF (Scandium monofluoride)
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 0.0000 0.0133 0.0133 0.0141 0.0341 0.0318 0.0314 0.0338 0.0326 0.0581 0.0355 0.0335 0.0626 0.0769 0.0469 0.0747 0.0816
MP3=FULL         0.0250   0.0236       0.0288 0.0290 0.0584        
MP4=FULL   0.0126     0.0300       0.0321     0.0336 0.0657   0.0483 0.0789  
B2PLYP=FULL -0.0003 0.0036 0.0036 0.0034 0.0085 0.0085 0.0077 0.0079 0.0079 0.0151 0.0090 0.0086 0.0155   0.0132 0.0187  
Quadratic configuration interaction QCISD(T)=FULL         0.0283             0.0331 0.0627   0.0465 0.0758  
Coupled Cluster CCSD=FULL         0.0284           0.0334 0.0331 0.0631 0.0772 0.0465 0.0754 0.0817
CCSD(T)=FULL         0.0284           0.0334 0.0329 0.0633 0.0777 0.0465 0.0760 0.0824
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

scf.gif