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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 C2 atoms 1 and 2

For C2 (Carbon 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) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ
Moller Plesset perturbation MP2=FULL 0.0002 0.0002 0.0002 0.0002 0.0009 0.0015 0.0015 -0.0009 0.0010 0.0030 0.0010 0.0009 0.0057 0.0039 0.0010 0.0073 0.0040 0.0009 0.0026
MP3=FULL         0.0008   0.0014       0.0010 0.0008 0.0056            
MP4=FULL   0.0001     0.0014       0.0010     0.0010 0.0063   0.0011 0.0082      
B2PLYP=FULL 0.0000 0.0016 0.0001 0.0001 -0.0046 0.0005 -0.0048 0.0003 0.0004 0.0009 0.0003 0.0003 0.0016   0.0003 0.0021      
Quadratic configuration interaction QCISD(T)=FULL         0.0015             0.0009 0.0052   0.0009 0.0064      
Coupled Cluster CCSD=FULL         0.0013         0.0031 0.0011 0.0009 0.0060 0.0040 0.0009 0.0078 0.0041    
CCSD(T)=FULL         0.0015           0.0010 0.0009 0.0061 0.0036 0.0009 0.0064 0.0037 0.0010 0.0025
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-pCVDZ cc-pCVTZ

c2q1.gif