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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 Na2 atoms 1 and 2

For Na2 (Sodium diatomic)
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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ
Moller Plesset perturbation MP2=FULL   0.0012 -0.7453 0.0026 0.0288 0.0177 0.0186 0.0623   0.1760 0.1229 0.1229 0.0216 -0.0044 0.0961 0.2074 0.0117 0.1131 0.9403 0.0377 0.0946 0.1008
MP3=FULL         -0.0109   -0.0097                             0.0906
MP4=FULL   0.0009 0.0118 0.0023 0.0164 0.0162 0.0169 0.0505 0.0499 0.1950 0.1243 0.1243 0.0178 -0.0053 0.1036 0.2163 0.0112 0.1220 1.2211 0.0310 0.0873 0.0946
B2PLYP=FULL 0.0026 -0.0004 0.0292 0.0004 0.0044 0.0042   0.0174 0.0174 0.0577     0.0062 -0.0018 0.0312   0.0045 0.0378       0.0332
Quadratic configuration interaction QCISD(T)=FULL                                           0.0864
Coupled Cluster CCSD=FULL 0.0144 0.0005 0.0095 0.0016 0.0149 0.0148 0.0156 0.0412 0.0416 0.1868 0.1112 0.1112 0.0137 -0.0062 0.1000 0.2127 0.0099 0.1180 0.9435 0.0272   0.0821
CCSD(T)=FULL 0.0134 0.0005 0.0092 0.0016 0.0149 0.0147 0.0155 0.0449 0.0448 0.1925 0.1154 0.1155 0.0122 -0.0068 0.1031 0.2170 0.0102 0.1239 1.2238 0.0257 0.0784 0.0859
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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ aug-cc-pCVTZ

na2q1.gif