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Calculated Ionization Energy for CH3CN (Acetonitrile)

Experimental Ionization Energy is 12.2 ± 0.01 eV
Please note! These calculated ionizataion energies have the vibrational zero-point energy (zpe) included, but the zpe has NOT been scaled. Click on an entry for more details, including the ionization energy with a scaled zpe.
Original data displayed. Press to display differences.
Differences displayed. Press to display original data.

Ionization Energies in eV
Methods with predefined basis sets
semi-empirical PM3  
composite G4 12.043

Ionization Energies in eV
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) Def2TZVPP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ
hartree fock HF 9.772 10.961 10.961     10.663   10.749 10.731             10.683
density functional B1B95                         11.615 11.664 11.643 11.683
B3LYP   11.809 11.809                          
B3PW91       11.847     11.805   11.823       11.691      
mPW1PW91   11.859 11.891 11.841       11.789 11.801 11.635            
M06-2X     12.046                          
HSEh1PBE         11.654                      
TPSSh         11.569                 11.649    
wB97X-D                               11.835
B97D3             11.592       11.613     11.578   11.552
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) Def2TZVPP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2 11.548 12.370 12.370   12.228 12.345   12.364 12.475     12.558        
MP2=FULL   12.371       12.350   12.465 12.484              
MP3=FULL             11.892                  
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) Def2TZVPP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ

Ionization Energies in eV
Methods with effective core potentials (select basis sets)
daug-cc-pVDZ daug-cc-pVTZ daug-cc-pVQZ Sadlej_pVTZ CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD
hartree fock HF         10.849   10.858     10.911
density functional B3LYP           11.865   11.963    
Moller Plesset perturbation MP2         12.683   12.729     12.766
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.