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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 BeO+ atoms 1 and 2

For BeO+ (Beryllium monoxide cation)
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
Moller Plesset perturbation MP2=FULL -0.0000 0.0001 0.0001 0.0002 -0.0335 0.0029 0.0034 -0.0365 0.0020 0.0104 0.0011 0.0016 0.0046 0.0063 0.0087 0.0110 0.0076
MP3=FULL         0.0357   0.0022                    
MP4=FULL   0.0001     0.0031       0.0020     0.0016 0.0050   0.0094 0.0123  
Coupled Cluster CCSD=FULL         0.0031           0.0011 0.0016 0.0048 0.0065 0.0094 0.0119 0.0082
CCSD(T)=FULL         0.0031           0.0011 0.0016 0.0049 0.0066 0.0094 0.0122 0.0080
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

beoq1.gif