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Comparison of experiment and theory for aClNaCl

Species with coordinate aClNaCl
Species Name
Na2Cl2 Disodium dichloride
The small subscript is the number of angles with completed calculations.
Click on an entry for a histogram of the difference distribution.
rms differences (calculated - experiment) in degrees
Methods with predefined basis sets

rms differences (calculated - experiment) in degrees
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 aug-cc-pVDZ aug-cc-pVTZ
hartree fock HF 0.02 3.92 0.42 3.12 0.92 0.12   0.82 0.82 0.92 0.62   0.22     0.92
density functional LSDA 2.22 3.42 1.82 1.62 1.02 1.02 0.52 0.42 0.42 3.02     0.52 2.02 1.62  
SVWN   3.42     0.92   0.72         0.32        
BLYP 2.22 1.62 2.62 0.62 56.72 1.62 1.32 1.22 1.12 2.82         2.32  
B1B95 1.32 3.42 0.62 1.92 0.72 0.72 0.42 0.02 0.02 1.72     0.32 1.62 0.42  
B3LYP 1.72 2.42 1.92 1.32 0.72 1.42 1.12 0.62   2.32 1.72 1.02 1.22     2.12
B3LYPultrafine         0.72                 0.92   0.32
B3PW91   3.32 0.42 2.02 0.72 0.72 0.42 0.02   1.92         1.62  
mPW1PW91   3.42   2.22 0.62 0.62 0.42 0.02 0.12 1.82         1.42  
M06-2X     56.72   56.72                      
PBEPBE   2.42     1.42 1.42 0.92 0.72 0.72 2.52 1.82   1.22 2.22    
PBEPBEultrafine         0.92                      
PBE1PBE         0.72                      
HSEh1PBE   3.32     0.72   0.52             1.72    
TPSSh         56.72   56.72     56.72       56.72    
wB97X-D     56.72   56.72   56.72   56.72     56.62 56.72 56.72   56.72
B97D3   56.62     56.72       56.72             56.72
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 aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2   3.02 0.82 2.02 56.72 0.72 0.82 56.62 0.92 0.02   2.32 0.52      
MP2=FULL   3.02     0.62 0.52 1.12 0.52             0.32  
MP3         0.72   56.72                  
MP3=FULL         56.72   56.62                  
MP4         56.72                      
B2PLYP         0.62                 56.72    
B2PLYP=FULLultrafine         0.92                      
Configuration interaction CID         0.62                      
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 aug-cc-pVDZ aug-cc-pVTZ
Quadratic configuration interaction QCISD   2.92     0.52     0.82                
Coupled Cluster CCD         0.62                      
CCSD         56.72                      
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 aug-cc-pVDZ aug-cc-pVTZ

rms differences (calculated - experiment) in degrees
Methods with effective core potentials (select basis sets)
CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD
hartree fock HF 5.42 2.62 4.22 0.22 3.72 2.42
density functional B1B95   2.32        
B3LYP 4.92 2.32 3.52 0.22 2.92 0.82
Moller Plesset perturbation MP2 4.82 2.82 3.42 0.32 3.12 1.42
For descriptions of the methods (AM1, HF, MP2, ...) and basis sets (3-21G, 3-21G*, 6-31G, ...) see the glossary in section I.C. Predefined means the basis set used is determined by the method.