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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 AsN atoms 1 and 2

For AsN (Arsenic mononitride)
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 0.0010 0.0009 0.0002 0.0024 0.0044 0.0054 0.0050 0.0054 0.0091 0.0127 -0.0010 0.0010 0.0057 0.0088 0.0020 0.0103 0.0114
MP3=FULL         0.0131   0.0169                    
MP4=FULL   0.0018     0.0052       0.0061     0.0018 0.0079   0.0034 0.0131  
Coupled Cluster CCSD=FULL         0.0039           -0.0004 0.0006 0.0040 0.0058 0.0012 0.0068  
CCSD(T)=FULL         0.0039           -0.0007 0.0006 0.0042 0.0061 0.0016 0.0073 0.0084
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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