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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 ClO atoms 1 and 2

For ClO (Monochlorine monoxide)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
Methods with standard basis sets
3-21G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ
Moller Plesset perturbation MP2=FULL 0.0001 0.0013 0.0022 0.0021 0.0063 0.0008 0.0032 0.0012 0.0018 0.0036 0.0021 0.0026 0.0038 0.0013 0.0026 0.0027
MP3=FULL   0.0027   0.0036                       0.0028
MP4=FULL                               0.0028
B2PLYP=FULL                               0.0006
Coupled Cluster CCSD=FULL   0.0014         0.0034   0.0021     0.0028       0.0033
CCSD(T)=FULL   0.0026           0.0009 0.0037         0.0017 0.0030 0.0026
3-21G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ

cloq1.gif