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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 GeH atoms 1 and 2

For GeH (germylidene)
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) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL 0.0020 0.0004 0.0002 0.0017 0.0012 0.0044 0.0044 0.0075 0.0128 0.0147 -0.0003 0.0007 0.0058   0.0036 0.0136 0.0303
MP3=FULL         0.0044   0.0059       -0.0020 0.0005 0.0043        
MP4=FULL   0.0005     0.0025       0.0124     0.0008 0.0062   0.0039 0.0119  
B2PLYP=FULL 0.0011 0.0037 0.0001 0.0007 0.0031 0.0014 0.0020 0.0025 0.0042 0.0053 -0.0002 0.0002 0.0020   0.0011 0.0038  
Quadratic configuration interaction QCISD(T)=FULL         0.0022               0.0048   0.0037 0.0113  
Coupled Cluster CCSD=FULL         0.0022         0.0140 -0.0010 0.0006 0.0052 0.0202 0.0032 0.0108  
CCSD(T)=FULL         0.0021           -0.0012   0.0048 0.0206 0.0037 0.0111  
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ

gehq1.gif