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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- (oxygen diatomic anion)
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 daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.0000 0.0001 0.0001 -0.0000 -0.0240 0.0008 0.0009 -0.0203 0.0014 0.0019 0.0012 0.0004 0.0046 0.0027 0.0005 0.0628 0.0034 0.0006 0.0066
MP3=FULL         0.0095   0.0049       0.0006 0.0004 0.0039         0.0005 0.0058
MP4=FULL   0.0003     0.0011       0.0019     0.0004 0.0046   0.0005 0.0073   0.0006 0.0072
B2PLYP=FULL 0.0000 0.0329 0.0000 -0.0000 0.0190 0.0002 0.0239 0.0004 0.0005 0.0005 0.0002 0.0001 -0.0182   0.0002 0.0019   0.0002 0.0019
Quadratic configuration interaction QCISD(T)=FULL         0.0012             0.0008 0.0048   0.0005 0.0063   0.0006 0.0067
Coupled Cluster CCSD=FULL         0.0008         0.0016 0.0008 0.0004 0.0041 0.0025 0.0005 0.0062 0.0031 0.0006 0.0062
CCSD(T)=FULL         0.0008           0.0008 0.0008 0.0043 0.0020 0.0005 0.0066 0.0031 0.0006 0.0067
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 daug-cc-pVDZ daug-cc-pVTZ

o2q1.gif