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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 F2- atoms 1 and 2

For F2- (flourine 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 -0.0002 0.0001 0.0001 0.0002 -0.0128 0.0007 0.0012 -0.0209 0.0008 0.0017 0.0002 0.0004 0.0018 0.0012 0.0011 0.0079 0.0022 0.0012 0.0106
MP3=FULL         0.0099   -0.0163       0.0001 0.0003 0.0018         0.0011 0.0110
MP4=FULL   0.0001     0.0007       0.0007     0.0003 0.0018   0.0011 0.0083   0.0011 0.0118
B2PLYP=FULL 0.0000 -0.0026 0.0000 0.0001 0.0107 0.0002 0.0238 0.0002 0.0002 0.0006 0.0000 0.0001 -0.0500   0.0004 0.0027   0.0004 0.0037
Quadratic configuration interaction QCISD(T)=FULL         0.0007             0.0003 0.0018   0.0011 0.0095   0.0012 0.0125
Coupled Cluster CCSD=FULL         0.0007         0.0015 0.0001 0.0003 0.0018 0.0011 0.0011 0.0091 0.0023 0.0012 0.0121
CCSD(T)=FULL         0.0010           0.0001 0.0003 0.0018 0.0011 0.0011 0.0093 0.0021 0.0012 0.0123
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

f2q1.gif