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Geometry Comparison

CaF (Calcium monofluoride)


distance is atom 1 (Ca) to atom 2 (F)

Experimental bond length is 1.967  Å

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Calculated bond length in Å
Methods with predefined basis sets
semi-empirical PM6 1.965
composite G2 2.032
G3B3 1.910
G4 1.923

Calculated bond length in Å
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 cc-pVDZ cc-pVTZ
hartree fock HF 3.986 2.052 2.019 2.090 2.032 2.032 2.072 1.992 1.992 2.003   2.119    
density functional LSDA 2.173 2.079 2.014 2.100 2.009 2.009 2.057 1.912 1.912 1.962        
BLYP 2.206 2.139 2.056 2.147 2.280 2.052 2.106 1.956 1.956 2.007        
B1B95 2.190   2.029 2.110 2.030 2.030   1.948 1.948 1.989        
B3LYP     2.035 2.118 2.035 2.035 2.087 1.954 1.954 1.995   2.142    
B3PW91 2.197 2.090 2.032 2.112 2.032 2.032 2.080 1.949 1.949 1.990        
mPW1PW91 2.196 2.081 2.026 2.105 2.029 2.029 2.076 1.949 1.949 1.987        
M06-2X     2.029   2.031           1.962      
PBEPBE 2.200 2.124 2.047 2.137 2.044 2.044 2.095 1.945 1.945 1.997        
PBE1PBE         2.028                  
HSEh1PBE   2.083     2.029   2.076             1.943
TPSSh         2.280   2.280     2.280       2.280
wB97X-D     2.280   2.280   2.280   2.280     2.280 2.280 2.280
B97D3   2.280     2.280   2.280   2.280   2.280 2.172   2.280
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 cc-pVDZ cc-pVTZ
Moller Plesset perturbation MP2 4.070 2.213   2.117 2.280 2.044 2.102 2.280 1.983 1.996   2.477    
MP2=FULL 4.066 2.083 2.038 2.117 2.044 2.044 2.101 1.982 1.982 1.995        
MP3             2.280              
MP3=FULL         2.280   2.280              
MP4 4.115 2.230     2.046       1.983 1.998        
B2PLYP         2.037                 dnf
B2PLYP=FULLultrafine         2.036               1.959 1.963
Configuration interaction CID   2.195     2.039       1.985 1.992        
CISD   2.202     2.040       1.985 1.993        
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 cc-pVDZ cc-pVTZ
Quadratic configuration interaction QCISD 2.325 2.219   2.117 2.044 2.044 2.097 1.987 1.987 1.995        
QCISD(T)   2.222   2.117 2.044   2.098 1.985 1.985 1.995        
Coupled Cluster CCD 4.079 2.203   2.111 2.041 2.041 2.092 1.986 1.986 1.993        
CCSD(T)   2.219   2.116 2.043   2.043 1.985 1.985 1.995        
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 cc-pVDZ cc-pVTZ

Calculated bond length in Å
Methods with effective core potentials (select basis sets)
CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD cc-pVTZ-PP aug-cc-pVTZ-PP Def2TZVPP
hartree fock HF 1.943   1.949   2.102 2.012     2.280
density functional B3LYP 1.942   1.953   2.114 1.961     2.280
PBEPBE                 2.280
Moller Plesset perturbation MP2 1.975   1.983   2.127 2.021     dnf
Values that are outliers may reflect incorrect atom numbering for different levels of theory.
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