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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 NaCl+ atoms 1 and 2

For NaCl+ (sodium chloride 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) cc-pVDZ cc-pVTZ cc-pVQZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL 0.0073 0.0013 0.0059 0.0024 -0.2993 0.0062 0.0079 -0.2731 0.0160 0.0436 0.0066 0.0515 0.0727 0.0505
MP3=FULL         0.3003   0.0040              
Coupled Cluster CCSD(T)=FULL                         0.0767  
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ cc-pV(T+d)Z

naclq1.gif