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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 CrH+ atoms 1 and 2

For CrH+ (Chromium hydride 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 cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL 0.0178 0.0087 0.0087 0.0006 0.0081 0.0160 0.0217 0.0198 0.0230 0.0180 0.0321 0.0263 0.0294 0.0389 0.0385 0.0301 0.0376 0.0448
MP3=FULL         -0.0009   0.0063       0.0058 0.0066 0.0140 0.0133        
MP4=FULL   0.0056     -0.0005       0.0156   0.0185   0.0175 0.0244   0.0190 0.0233  
B2PLYP=FULL -0.0003 0.0042 0.0042 0.0040 0.0046 0.0067 0.0041 0.0039 0.0052 0.0061 0.0042 0.0059 0.0063 0.0061   0.0067 0.0058  
Quadratic configuration interaction QCISD(T)=FULL         -0.0032           0.0076   0.0146 0.0132   0.0143 0.0121  
Coupled Cluster CCSD=FULL         -0.0025         0.0048 0.0056 0.0132 0.0146 0.0122 0.0113 0.0152 0.0115 0.0181
CCSD(T)=FULL         -0.0030           0.0059 0.0127 0.0144 0.0123 0.0109 0.0153 0.0114 0.0176
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 cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ

crhq1.gif