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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 BN atoms 1 and 2

For BN (boron nitride)
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 -0.0000 -0.0000 -0.0000 0.0000 0.0149 0.0012 0.0012 0.0109 0.0008 0.0035 0.0010 0.0004 0.0037 0.0029 0.0008 -0.0015 0.0029
MP3=FULL         0.0018   0.0016       0.0017 0.0008 0.0057        
MP4=FULL   0.0002     0.0012       0.0011     0.0006 0.0038   0.0011 0.0054  
B2PLYP=FULL 0.0000 0.0000 0.0000 0.0000 0.0005 0.0005 0.0005 0.0004 0.0004 0.0016 0.0005 0.0002 0.0012   0.0005 0.0021  
Quadratic configuration interaction QCISD(T)=FULL         0.0017             0.0009 0.0062   0.0017 0.0084  
Coupled Cluster CCSD=FULL         0.0018           0.0019 0.0010 0.0059 0.0043 0.0018 0.0082 0.0044
CCSD(T)=FULL         0.0016           0.0017 0.0011 0.0056 0.0039 0.0019 0.0078 0.0040
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

bnq1.gif