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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 SiP- atoms 1 and 2

For SiP- (Silicon monophosphide anion)
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) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.0000 -0.0008 0.0031 -0.0002 -0.1093 0.0030 0.0029 -0.1116 0.0008 0.0112 0.0026 0.0068   0.0109  
MP3=FULL         0.0889   0.0018                
Coupled Cluster CCSD(T)=FULL                         0.0053   0.0064
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVTZ aug-cc-pVQZ

sipq1.gif