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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 SeCl atoms 1 and 2

For SeCl (Selenium 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
Moller Plesset perturbation MP2=FULL 0.0001 0.0000 0.0007 0.0001 0.0043 0.0043 0.0035 0.0027 0.0027 0.0130 -0.0007 0.0014 0.0048 0.0022 0.0011 0.0076 0.0036
MP3=FULL         0.0027   0.0026       -0.0010 0.0009 0.0040        
MP4=FULL   -0.0001     0.0033       0.0023     0.0012 0.0049   0.0011 0.0082  
B2PLYP=FULL 0.0000 -0.0001 0.0003 -0.0001 0.0012 0.0012 0.0014 0.0010 0.0010 0.0041 -0.0001 0.0004 0.0015   0.0004 0.0023  
Quadratic configuration interaction QCISD(T)=FULL         0.0032             0.0012 0.0048   0.0011 0.0074  
Coupled Cluster CCSD=FULL         0.0031         0.0115 -0.0002 0.0011 0.0047 0.0022 0.0011 0.0073 0.0034
CCSD(T)=FULL         0.0032           -0.0003 0.0012 0.0047 0.0020 0.0011 0.0073 0.0039
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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