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Calculated Ionization Energy for AlS (Aluminum sulfide)

20 09 09 14 00
Experimental Ionization Energy is 9.5 ± 0.5 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 9.446

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) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVTZ
hartree fock HF 5.173 9.517 9.541 9.529 9.550 9.550 9.579 9.581 9.581 9.497   9.529 9.520 9.508 9.516 9.574 9.519 9.518 9.520
density functional LSDA 6.212 5.498 10.010 10.212 10.026 10.026 10.059 10.068 10.068 9.960     10.022 10.002   10.078      
BLYP 5.499 9.487 9.332 9.518 10.953 9.353 9.399 9.401 9.401 9.299     9.344 9.331          
B1B95 5.749   9.507 9.697 9.505 9.517   9.540 9.540 9.447     9.512 9.450          
B3LYP 5.785 9.779 9.629 9.809 9.647 9.647 9.685 9.688 9.688 9.590   9.658 9.638 9.618   9.702 9.630 9.622  
B3LYPultrafine         9.647                       9.631    
B3PW91 5.905 9.878 9.723 9.899 9.731 9.731 9.756 9.751 9.751 9.669     9.727 9.689          
mPW1PW91 5.906 9.865 9.740 9.919 9.724 9.724 9.750 9.742 9.769 9.688     9.717 9.680          
M06-2X     9.703   9.715                            
PBEPBE 5.690 9.692     9.541 9.541 9.574 9.569 9.569 9.482     9.536 9.503          
PBE1PBE         9.720                            
HSEh1PBE   9.851     9.705   9.732             9.663          
TPSSh         9.674   9.699     9.610       9.629          
wB97X-D     9.714   9.714   9.742   9.738     9.712 9.742 9.669     9.678    
B97D3             9.542       9.461 9.514   9.472          
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVTZ
Moller Plesset perturbation MP2 4.637 9.195 9.168 9.236 9.194 9.194 9.228 9.226 9.226 9.314   9.219 9.263 9.345   9.400 9.384    
MP2=FULL 4.614 9.190     9.182 9.182 9.215 9.216 9.216       9.256            
MP3         9.265                            
MP3=FULL         9.257   9.289                        
MP4         9.102                 9.291          
B2PLYP         9.408                 9.442          
Configuration interaction CID         9.308     9.343                      
CISD         9.283                            
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVTZ
Quadratic configuration interaction QCISD   9.038     9.185 9.185 9.218 9.223 9.223       9.251 9.371          
QCISD(T)         9.142                            
Coupled Cluster CCD         9.250     9.285                      
CCSD         9.227                            
CCSD(T)                           9.353          
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 cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ daug-cc-pVTZ

Ionization Energies in eV
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 9.711 9.677 9.571 9.583 9.732 9.463     9.499
density functional B3LYP 9.924   9.789 9.633 9.953 9.780     9.606
PBEPBE                 9.487
Moller Plesset perturbation MP2 9.325 9.339 9.247 9.276 9.331 9.176     9.334
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.