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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 CBr atoms 1 and 2

For CBr (Carbon monobromide)
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) 6-311+G(3df,2p) TZVP Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL 0.0001 0.0000 0.0002 0.0008 0.0037 0.0037 0.0038 0.0029 0.0029 0.0128 0.0068 -0.0002 0.0024 0.0018 0.0074 0.0037 0.0021 0.0097 0.0044
MP3=FULL         0.0040   0.0041       0.0064 -0.0002 0.0022 0.0017 0.0073        
MP4=FULL   0.0001     0.0040       0.0026   0.0068   0.0025 0.0018 0.0070   0.0021 0.0101  
B2PLYP=FULL 0.0000 0.0000 0.0001 0.0003 0.0011 0.0011 0.0012 0.0008 0.0008 0.0042 0.0021 -0.0000 0.0007 0.0006 0.0022   0.0007 0.0028  
Quadratic configuration interaction QCISD(T)=FULL         0.0042           0.0069   0.0025 0.0019 0.0075   0.0022 0.0092  
Coupled Cluster CCSD=FULL         0.0041         0.0126 0.0067 0.0002 0.0026 0.0018 0.0076 0.0040 0.0022 0.0098 0.0047
CCSD(T)=FULL         0.0041           0.0061 0.0005 0.0023 0.0019 0.0073 0.0040 0.0022   0.0047
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ

cbr.gif