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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 BO- atoms 1 and 2

For BO- (boron monoxide 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 0.0001 0.0001 0.0001 -0.0129 0.0014 0.0016 -0.0110 0.0011 0.0054 0.0007 0.0053 0.0035 0.0064 0.0038
MP3=FULL         0.0098   0.0049                
Coupled Cluster CCSD(T)=FULL                         0.0034   0.0038
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

boq1.gif