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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 N2 atoms 1 and 2

For N2 (Nitrogen 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 cc-pCVQZ Sadlej_pVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.0001 0.0001 0.0001 0.0002 0.0010 0.0010 0.0010 0.0011 0.0011 0.0021 0.0027 0.0020 0.0006 0.0007 0.0044 0.0029 0.0009 0.0057 0.0030 0.0006 0.0020 0.0023 0.0005 0.0009 0.0056
MP3=FULL   0.0001 0.0001 0.0001 0.0006 0.0006 0.0007 0.0006 0.0006 0.0017     0.0005 0.0004 0.0028   0.0005 0.0036   0.0005 0.0016 0.0019   0.0005 0.0034
MP4=FULL 0.0001 0.0001 0.0001 0.0001 0.0007 0.0007 0.0007 0.0006 0.0007 0.0020 0.0019 0.0019 0.0005 0.0006 0.0035 0.0023 0.0006 0.0045 0.0024 0.0005 0.0015 0.0018   0.0007 0.0043
B2PLYP=FULL 0.0000 0.0000 0.0000 0.0000 0.0003 0.0003 0.0003 0.0003 0.0003 0.0006 0.0008   0.0001 0.0002 0.0013   0.0003 0.0016   0.0002 0.0005 0.0006   0.0003 0.0016
Quadratic configuration interaction QCISD(T)=FULL         0.0010   0.0007       0.0026     0.0007 0.0044 0.0022 0.0009 0.0062 0.0023         0.0009 0.0060
Coupled Cluster CCSD=FULL         0.0009         0.0017 0.0026   0.0005 0.0007 0.0043 0.0029 0.0008 0.0060 0.0030 0.0006 0.0017 0.0021   0.0009 0.0057
CCSD(T)=FULL 0.0001 0.0001 0.0001 0.0001 0.0010 0.0007 0.0007 0.0007 0.0007 0.0018 0.0026 0.0018 0.0006 0.0007 0.0045 0.0028 0.0009 0.0062 0.0030         0.0009 0.0059
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 cc-pCVQZ Sadlej_pVTZ daug-cc-pVDZ daug-cc-pVTZ

n2q1.gif