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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 CSe atoms 1 and 2

For CSe (Carbon monoselenide)
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
Moller Plesset perturbation MP2=FULL 0.0002 0.0001 0.0002 0.0010 0.0127 0.0031 0.0032 0.0134 0.0049 0.0102 0.0008 0.0057
MP3=FULL             0.0153          
Coupled Cluster CCSD(T)=FULL                     0.0010 0.0060
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

cseq1.gif