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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 BeCl atoms 1 and 2

For BeCl (beryllium monochloride)
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 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL -0.0005 0.0000 0.0071 0.0034 0.0034 0.0058 0.0023     0.0101 0.0036   0.0131
MP3=FULL     -0.0010   0.0037                
B2PLYP=FULL     -0.0053   -0.0059                
Coupled Cluster CCSD(T)=FULL     0.0032         0.0021 0.0133   0.0042 0.0144  
STO-3G 3-21G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z

beclq1.gif