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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 NaO atoms 1 and 2

For NaO (sodium monoxide)
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 cc-pCVTZ
Moller Plesset perturbation MP2=FULL 0.0131 0.0042 -0.1317 -0.1278 -0.0658 0.0139 0.0339 -0.0815 0.0062 -0.0693 -0.0985 -0.0999 -0.0914 0.0415 0.0345 0.0415 0.2420 0.0198
MP3=FULL         0.0872   0.0054       0.0060 0.0050 0.0092         0.0193
MP4=FULL   0.0024     -0.1135       0.0041     0.0047 0.0086   0.0368 0.0466   0.0215
B2PLYP=FULL -0.0007 0.0270 0.0013 0.0007 -0.0868 0.0031 -0.0528 0.0014 -0.1149 0.0091 0.0020 0.0017 -0.2030   0.0116 0.0133   0.0058
Quadratic configuration interaction QCISD(T)=FULL         -0.1162             0.0055 0.0084   0.0370 0.0465   0.0210
Coupled Cluster CCSD=FULL         -0.1127         0.0284 0.0059 0.0053 0.0091 0.0445 0.0359 0.0437 0.2355 0.0188
CCSD(T)=FULL         0.0080           0.0069 0.0044 0.0086 0.0446 0.0365 0.0454 0.2450 0.0200
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 cc-pCVTZ

naoq1.gif