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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 TiCl atoms 1 and 2

For TiCl (Titanium 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 aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.0017 -0.0026 0.0077 -0.0019 0.0171 0.0171 0.0287 0.0284 0.0284 0.0384 0.0249 0.0274 0.0481 0.0442 0.0521
MP3=FULL         0.0072   0.0135       0.0074 0.0147 0.0253    
MP4=FULL   -0.0065     0.0092       0.0199     0.0180 0.0372 0.0337 0.0418
B2PLYP=FULL 0.0004 -0.0017 0.0074 -0.0010 0.0050 0.0050 0.0082 0.0087 0.0087 0.0119 0.0073 0.0085 0.0133 0.0136 0.0144
Quadratic configuration interaction QCISD(T)=FULL         0.0332             0.0379 0.0503 0.0560 0.0554
Coupled Cluster CCSD=FULL         0.0303         0.0444 0.0419        
CCSD(T)=FULL         0.0323           0.0452 0.0373 0.0481 0.0554 0.0532
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 aug-cc-pVDZ aug-cc-pVTZ

ticl.gif