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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 SiSe+ atoms 1 and 2

For SiSe+ (Silicon Monoselenide cation)
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 daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.0003 -0.0005 0.0006 0.0015 0.0023 0.0023 0.0022 0.0010 0.0010 0.0102 0.0035 -0.0018 0.0014 0.0034 0.0017 0.0015 0.0064 0.0025 0.0016 0.0063
MP3=FULL         0.0020   0.0019       0.0011 -0.0026 0.0013 0.0028         0.0016 0.0060
MP4=FULL   -0.0013     0.0024       0.0011   0.0035   0.0015 0.0034   0.0016 0.0061   0.0017 0.0065
B2PLYP=FULL 0.0002 -0.0001 0.0006 0.0004 0.0015 0.0015 0.0015 0.0010 0.0010 0.0048 0.0020 -0.0007 0.0008 0.0017   0.0008 0.0030   0.0009 0.0029
Quadratic configuration interaction QCISD(T)=FULL         0.0053           0.0067   0.0027 0.0059   0.0026 0.0105   0.0029 0.0103
Coupled Cluster CCSD=FULL         0.0043         0.0140 0.0059 -0.0021 0.0022 0.0051 0.0031 0.0024 0.0095 0.0043 0.0027 0.0093
CCSD(T)=FULL         0.0045           0.0055 -0.0021 0.0024 0.0052 0.0027 0.0025 0.0095 0.0044 0.0027 0.0093
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 daug-cc-pVDZ daug-cc-pVTZ

siseq1.gif