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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 LiH atoms 1 and 2

For LiH (Lithium Hydride)
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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.0001 0.0000 -0.0000 0.0002 0.0006 0.0014 0.0015 0.0092 0.0047 0.0074 0.0091 0.0091 0.0025 0.0037 0.0004 0.0198 0.0336 0.0123 0.0333 0.0038 0.0080 0.0442 0.0216
MP3=FULL         0.0026   -0.0019                             0.0514 0.0234
MP4=FULL -0.0001 -0.0005 0.0000 0.0003 0.0020 0.0014 0.0017 0.0022 0.0050 0.0108 0.0098 0.0107 0.0017 0.0035 0.0125 0.0231 0.0402 0.0181 0.0376     0.0534 0.0243
B2PLYP=FULL   0.0054     0.0060   0.0012                             0.0144 0.0066
Quadratic configuration interaction QCISD(T)=FULL         0.0007   0.0011             0.0028 0.0122 0.0228 0.0408 0.0181 0.0384     0.0544 0.0243
Coupled Cluster CCSD=FULL -0.0001 0.0000 0.0000 0.0003 0.0005 0.0010 0.0011 0.0018 0.0046 0.0079 0.0102 0.0106 0.0017 0.0036 0.0089 0.0223 0.0404 0.0128 0.0377        
CCSD(T)=FULL -0.0002 -0.0004 -0.0000 0.0003 0.0011 0.0009 0.0010 0.0022 0.0046 0.0104 0.0102 0.0106 0.0016 0.0032 0.0120 0.0228 0.0404 0.0177 0.0385 0.0036 0.0078 0.0544 0.0243
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) 6-311+G(3df,2pd) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ cc-pCVDZ cc-pCVTZ daug-cc-pVDZ daug-cc-pVTZ

lihq1.gif