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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 PH atoms 1 and 2

For PH (phosphorus monohydride)
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 Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL 0.0001 -0.0002 -0.0000 -0.0001 -0.0000 0.0008 0.0010 -0.0003 0.0005 0.0023 0.0014 0.0003 0.0025 0.0013 0.0036 0.0052 0.0016 0.0056 0.0056 0.0036 0.0017 0.0037
MP3=FULL         -0.0012   0.0010       0.0007 0.0002 0.0025 0.0013 0.0039           0.0017 0.0042
MP4=FULL   -0.0001     -0.0000       0.0004   0.0013     0.0015 0.0038   0.0018 0.0060     0.0019 0.0041
B2PLYP=FULL 0.0000 -0.0001 -0.0000 -0.0000 -0.0000 0.0003 0.0003 -0.0001 0.0001 0.0007 0.0004 0.0001 0.0008 0.0004 0.0010   0.0005 0.0016     0.0012 0.0011
Quadratic configuration interaction QCISD(T)=FULL         -0.0000   0.0011       0.0012   0.0023 0.0015 0.0040   0.0019 0.0056     0.0019 0.0043
Coupled Cluster CCSD=FULL         0.0001         0.0024 0.0016 0.0004 0.0023 0.0015 0.0036 0.0045 0.0024 0.0056 0.0058   0.0018 0.0040
CCSD(T)=FULL         0.0000           0.0012 0.0002 0.0023 0.0015 0.0040 0.0046 0.0019 0.0056 0.0049 0.0036 0.0019 0.0043
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 Def2TZVPP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ

phq1.gif