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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+ (Germaniun monohyrdide 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) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL 0.0015 0.0004 0.0002 0.0014 0.0015 0.0039 0.0039 0.0059 0.0104 0.0124 -0.0002 0.0006 0.0058 0.0197 0.0032 0.0117 0.0274
MP3=FULL         0.0013   0.0039       -0.0016 0.0005 0.0039        
MP4=FULL   0.0005     0.0016       0.0102     0.0010 0.0057   0.0034 0.0114  
B2PLYP=FULL 0.0009 0.0002 0.0000 0.0006 0.0005 0.0013 0.0013 0.0024 0.0035 0.0042 -0.0001 0.0000 0.0018   0.0011 0.0036  
Quadratic configuration interaction QCISD(T)=FULL         0.0014             0.0008 0.0049   0.0032 0.0104  
Coupled Cluster CCSD=FULL         0.0014         0.0118 -0.0008 0.0007 0.0048 0.0179 0.0033 0.0103 0.0248
CCSD(T)=FULL         0.0014           -0.0010 0.0008 0.0049 0.0185 0.0032 0.0104 0.0255
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