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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 CO+ atoms 1 and 2

For CO+ (carbon monoxide 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 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ cc-pCVQZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.0001 0.0001 0.0001 0.0002 -0.0311 0.0005 0.0005 -0.0301 0.0005 0.0019 0.0013 0.0005 -0.0316 0.0004 0.0019 0.0015 0.0005 0.0028 0.0015 0.0004 0.0011 0.0014 0.0005 0.0027
MP3=FULL         0.0176   0.0175       0.0014 0.0006 0.0016 0.0003 0.0022         0.0004 0.0012 0.0015 0.0005 0.0031
MP4=FULL   0.0001     0.0005       0.0005   0.0014   0.0015 0.0003 0.0021   0.0005 0.0031   0.0004   0.0015 0.0005 0.0031
B2PLYP=FULL 0.0000 0.0153 0.0000 0.0000 0.0088 0.0003 0.0088 0.0002 0.0001 0.0008 0.0006 0.0002 0.0006 0.0001 0.0009   0.0002 0.0013   0.0002 0.0005 0.0007 0.0002 0.0013
Coupled Cluster CCSD=FULL         0.0008         0.0027 0.0021 0.0008 0.0022 0.0004 0.0031 0.0025 0.0007 0.0045 0.0025 0.0007 0.0019 0.0024 0.0007 0.0045
CCSD(T)=FULL         0.0008           0.0020 0.0007 0.0021 0.0004 0.0030 0.0023 0.0007 0.0044 0.0024 0.0005   0.0022 0.0007 0.0044
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ cc-pCVQZ daug-cc-pVDZ daug-cc-pVTZ

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