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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 SiN atoms 1 and 2

For SiN (Silicon nitride)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
Methods with standard basis sets
3-21G 6-31G* 6-31G** 6-31+G** 6-311G* cc-pVDZ cc-pVQZ aug-cc-pVDZ cc-pV(T+d)Z aug-cc-pCVTZ
Moller Plesset perturbation MP2=FULL -0.0001 -0.0082 0.0007 0.0007 -0.0088 0.0005 0.0047 0.0014 0.0039 0.0027
MP3=FULL       -0.0000           0.0023
MP4=FULL                   0.0029
B2PLYP=FULL                   0.0011
Quadratic configuration interaction QCISD(T)=FULL                   0.0041
Coupled Cluster CCSD=FULL                   0.0040
CCSD(T)=FULL                   0.0039
3-21G 6-31G* 6-31G** 6-31+G** 6-311G* cc-pVDZ cc-pVQZ aug-cc-pVDZ cc-pV(T+d)Z aug-cc-pCVTZ

sinq1.gif