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III.G.10.b.

Bond Length differences between CCSD(T)=FULL (all electrons correlated) and CCSD(T) (frozen core) or MP2=FULL and MP2 (frozen core)

For BeCl+ atoms 1 and 2

For BeCl+ (beryllium monochloride cation)
Bond length differences (full - frozen) in Å
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) cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL -0.0001 -0.0000 -0.0005 -0.0002 -0.0032 -0.0032 -0.0033 -0.0016 -0.0016 -0.0072 -0.0018 -0.0098     -0.0107
Coupled Cluster CCSD(T)=FULL                     -0.0016 -0.0107 -0.0039 -0.0103