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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 P2 atoms 1 and 2

For P2 (Phosphorus 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-pV(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ
Moller Plesset perturbation MP2=FULL 0.0003 -0.0016 0.0023 -0.0006 -0.0251 0.0023 0.0023 -0.0241 0.0003 0.0089 -0.0010 0.0017 0.0045 0.0031 0.0021 0.0124 0.0041 0.0032 0.0065 0.0106 0.0017 0.0058
MP3=FULL         0.0099   0.0016       -0.0013 0.0015 0.0031             0.0075    
MP4=FULL   -0.0017     0.0014       -0.0005     0.0019 0.0041   0.0020 0.0077       0.0091    
B2PLYP=FULL 0.0000 -0.0003 0.0004 -0.0001 0.0007 0.0007 0.0007 0.0001 0.0001 0.0025 -0.0002 0.0006 -0.0148   0.0006 0.0022       0.0028    
Coupled Cluster CCSD=FULL         0.0021           -0.0004 0.0019 0.0040 0.0028 0.0020 0.0070 0.0036     0.0089    
CCSD(T)=FULL         0.0020           -0.0008 0.0020 0.0039 0.0031 0.0020 0.0072 0.0033 0.0018 0.0038 0.0090 0.0019 0.0044
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(D+d)Z cc-pV(T+d)Z aug-cc-pV(T+d)Z cc-pCVDZ cc-pCVTZ

p2q1.gif