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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 HBr+ atoms 1 and 2

For HBr+ (hydrogen bromide 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 0.0001 -0.0000 -0.0000 0.0008 0.0080 0.0016 0.0011 0.0047 0.0022 0.0080 0.0033 -0.0002 0.0012 0.0049 0.0036 0.0017 0.0084 0.0042 0.0018 0.0073
MP3=FULL         -0.0072   0.0001       0.0029 -0.0008 0.0012 0.0038         0.0017 0.0060
MP4=FULL   -0.0001     0.0004       0.0023   0.0027   0.0012 0.0046   0.0017 0.0079   0.0018 0.0068
B2PLYP=FULL 0.0000 -0.0010 -0.0000 0.0003 0.0000 0.0009 -0.0001 0.0001 0.0006 0.0027 0.0008 -0.0003 0.0004 0.0037   0.0005 0.0021   0.0006 0.0017
Quadratic configuration interaction QCISD(T)=FULL         0.0004           0.0026   0.0012 0.0043   0.0017 0.0079   0.0018 0.0068
Coupled Cluster CCSD=FULL         0.0005         0.0073 0.0025 -0.0009 0.0012 0.0044 0.0035 0.0018 0.0077 0.0040 0.0018 0.0067
CCSD(T)=FULL         -0.0232           0.0026 -0.0011 0.0012 0.0044 0.0034 0.0017 0.0080 0.0033 0.0018 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) 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

hbrq1.gif