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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)
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 cc-pV(T+d)Z aug-cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL 0.0003 -0.0001 0.0021 0.0001 0.2846 0.0026 0.0024 0.2844 0.0012 0.0101 0.0003 0.0024 0.0072 0.0337 0.0036 0.0020 0.0447 0.0093 0.0147
MP3=FULL         -0.2833   0.0000       -0.0004 0.0021 0.0061         0.0070 0.0124
MP4=FULL   -0.0002     0.0021       0.0007   -0.0001 0.0023 0.0058   0.0035 0.0119   0.0079 0.0132
B2PLYP=FULL 0.0001 -0.0000 0.0007 0.0000 0.0009 0.0009 0.0000 0.0004 0.0004 0.0033 0.0002 0.0008 0.0017   0.0012 0.0036   0.0029 0.0044
Coupled Cluster CCSD=FULL         0.0023           -0.0000 0.0022 0.0064 0.0330 0.0034 0.0116 0.0437 0.0082 0.0136
CCSD(T)=FULL         0.0023           0.0001 0.0023 0.0060 0.0338 0.0036 0.0112 0.0447 0.0081 0.0134
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 cc-pV(T+d)Z aug-cc-pV(T+d)Z

alclq1.gif