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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 O2-- atoms 1 and 2

For O2-- (dioxygen dianion)
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 cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.0000 0.0002 0.0002 0.0001 0.0008 0.0008 0.0009 0.0015 0.0015 0.0017 0.0037 0.0019 0.0004 0.0046 0.0044 0.0005 0.0095 0.0064 0.0031 0.0006 0.0020
MP3=FULL                                     0.0025    
MP4=FULL                                     0.0016    
B2PLYP=FULL 0.0000 0.0000 0.0000 0.0000 0.0002 0.0002 0.0003 0.0004 0.0004 0.0004 0.0010 0.0005 0.0001 0.0013   0.0001 0.0027   0.0009 0.0001 0.0081
Quadratic configuration interaction QCISD(T)=FULL         0.0011           0.0038   0.0007 0.0054   0.0004 0.0107   0.0031    
Coupled Cluster CCSD=FULL         0.0010         0.0020 0.0039 0.0020 0.0006 0.0050 0.0045 0.0006 0.0091 0.0058 0.0033    
CCSD(T)=FULL         0.0011           0.0040 0.0023 0.0014 0.0055 0.0052 0.0006 0.0103 0.0059 0.0035   0.0218
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 cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ aug-cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ

o2q1.gif