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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 AlO+ atoms 1 and 2

For AlO+ (aluminum monoxide 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
Moller Plesset perturbation MP2=FULL -0.0010 -0.0007 -0.0014 -0.0007 -0.0348 -0.0007 -0.0006 -0.0350 -0.0007 0.0011 -0.0006 0.0012 0.0057
MP3=FULL         0.0016   -0.0049            
Coupled Cluster CCSD(T)=FULL                         0.0139
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

aloq1.gif