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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 oxide)
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 0.0003 -0.0121 0.0036 0.0042 -0.0118 0.0025 0.0135 0.0013 0.0027 0.0052 0.0070 0.0110 0.0112 0.0085
MP3=FULL         0.0043   -0.0006                    
MP4=FULL   -0.0001     0.0123       0.0047     0.0029 0.0090   0.0212 0.0191  
Coupled Cluster CCSD=FULL         0.0034           0.0011 0.0023 0.0044 0.0061 0.0103 0.0101 0.0076
CCSD(T)=FULL         0.0034           0.0011 0.0027 0.0047 0.0068 0.0117 0.0112 0.0083
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