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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)
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 aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.0055 -0.0022 -0.0022 0.0089 0.0114 0.0148   0.0106 0.0199 0.0138   0.0188          
MP3=FULL         0.0070             0.0309          
MP4=FULL   -0.0082     0.0079       0.0111         0.0211      
B2PLYP=FULL 0.0017 -0.0012 -0.0012 0.0006 0.0025 0.0046 0.0060 0.0027 0.0040 0.0047 0.0046 0.0090 0.0076 0.0088 0.0062 0.0098 0.0060
Coupled Cluster CCSD=FULL         0.0061         0.0086   0.0159          
CCSD(T)=FULL         0.0060             0.0263          
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 aug-cc-pVDZ aug-cc-pVTZ

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