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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 S2+ atoms 1 and 2

For S2+ (sulfur diatomic cation)
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* 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-pVQZ cc-pV(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL 0.0007 0.0013 -0.0025 0.0046 0.0016 0.0015 0.0065 -0.0001 0.0066 0.0014 0.0030 0.0028 0.0035 0.0022 0.0047 0.0077
MP3=FULL       -0.0099   0.0007                    
Coupled Cluster CCSD(T)=FULL                           -0.0813 0.0040  
STO-3G 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-pVQZ cc-pV(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z

s2q1.gif