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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 BeF- atoms 1 and 2

For BeF- (Beryllium monofluoride anion)
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 -0.0001 -0.0000 -0.0000 0.0001 -0.0246 0.0038 0.0042 -0.0238 0.0024 0.0091 0.0011 0.0008 0.0048 0.0068 0.0045 0.0153 0.0093
MP3=FULL         0.0297   0.0050                    
MP4=FULL   0.0000     0.0040       0.0021     0.0008 0.0051   0.0046 0.0172  
Coupled Cluster CCSD=FULL         0.0040           0.0012 0.0009 0.0051 0.0072 0.0046 0.0167 0.0099
CCSD(T)=FULL         0.0040           0.0012 0.0009 0.0050 0.0071 0.0046 0.0169 0.0100
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

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