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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 Na2- atoms 1 and 2

For Na2- (sodium 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) 6-311+G(3df,2p) TZVP Def2TZVPP 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 0.0075 0.0087 0.0241 0.0155 0.1792 0.0527 0.0542 0.2234 0.0657 0.2257 0.1741 0.0266 0.2693 0.0330 0.1952 0.5958 0.0513 0.1310   0.0611 0.2016
MP3=FULL         0.0516   0.0533       0.1627 0.0190 0.1454 0.0278 0.1992         0.0553 0.2057
MP4=FULL   0.0070     0.0526       0.0686   0.1756   0.1479 0.0272 0.2052   0.0454 0.2558   0.0552 0.2127
B2PLYP=FULL 0.0025 0.0024 0.0079 0.0049 0.0180 0.0180 0.0179 0.0218 0.0218 0.0764 0.0522 0.0080 0.0482 0.0079 0.0635   0.0150 0.0765   0.0179 0.0658
Coupled Cluster CCSD=FULL         0.0448         0.2002 0.1269 0.0102 0.1129 0.0249 0.1769 0.5474 0.0422 0.2155 1.3664 0.0506 0.1825
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVDZ daug-cc-pVTZ

na2q1.gif