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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 H2- atoms 1 and 2

For H2- (hydrogen diatomic anion)
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 daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.0000 0.0000 0.0000 0.0000 -0.6472 0.0000 0.0000 -0.5768 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0007 -0.0000 0.0000 0.0000
MP3=FULL         0.0000   0.0000       0.0000 0.0000 0.0000         0.0000 0.0000
MP4=FULL   0.0000     0.0000       0.0000     0.0000 0.0000   0.0000 0.0000   0.0000 0.0000
B2PLYP=FULL 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000   0.0000 0.0000   0.0000 0.0000
Quadratic configuration interaction QCISD(T)=FULL         0.0000             0.0000 0.0000   0.0000 0.0000   0.0000 0.0000
Coupled Cluster CCSD=FULL         0.0000         0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
CCSD(T)=FULL         0.0000           0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
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 daug-cc-pVDZ daug-cc-pVTZ

h2q1.gif