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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 AlC atoms 1 and 2

For AlC (Aluminum carbide)
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 cc-pV(T+d)Z aug-cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL 0.0001 -0.0000 0.0012 0.0000 0.0023 0.0023 0.0025 0.0015 0.0015 0.0080 0.0002 0.0024 0.0079 0.0399 0.0047 0.0147 0.0514 0.0091 0.0161
MP3=FULL         0.0020   0.0021       -0.0004 0.0018 0.0075         0.0083 0.0153
MP4=FULL   0.0000     0.0022       0.0013     0.0027 0.0077   0.0052 0.0144   0.0086 0.0159
B2PLYP=FULL 0.0000 -0.0000 0.0004 0.0000 0.0008 0.0008 0.0009 0.0006 0.0006 0.0026 0.0002 0.0007 0.0025   0.0007 0.0045   0.0029 0.0050
Quadratic configuration interaction QCISD(T)=FULL         0.0023             0.0021 0.0087   0.0052 0.0147   0.0099 0.0165
Coupled Cluster CCSD=FULL         0.0022         0.0079 -0.0000 0.0016 0.0078 0.0395 0.0046 0.0146 0.0506 0.0094 0.0163
CCSD(T)=FULL         0.0022           0.0001 0.0020 0.0086 0.0400 0.0051 0.0145 0.0511 0.0097 0.0164
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 cc-pV(T+d)Z aug-cc-pV(T+d)Z

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