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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 AlCl- atoms 1 and 2

For AlCl- (aluminum monochloride anion)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
Methods with standard basis sets
6-31G* 6-31+G** cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL     0.0151
MP3=FULL   -0.0005  
Coupled Cluster CCSD(T)=FULL 0.0032    
6-31G* 6-31+G** cc-pV(T+d)Z

alclq1.gif