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Calculated Ionization Energy for B2H6 (Diborane)

20 09 09 14 00
Experimental Ionization Energy is 11.38 ± 0.05 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
composite G2 11.223
G3 11.186
G3B3 11.173
G4 11.145
CBS-Q 11.185

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-pVDZ daug-cc-pVTZ
hartree fock HF 10.057     10.586 9.321 10.450 10.470 10.466 10.387 10.366 10.374 10.402 10.350 10.373 10.373 10.336   10.372 10.338 10.368
density functional BLYP 10.151 10.691 10.691 10.600 10.527 10.494 10.594 10.664 10.624 10.489 10.624 10.616 10.498 10.621   10.593 10.619   10.592 10.619
B1B95 10.551 11.075 11.075 10.985 10.868 10.868 10.878 10.894 10.848 10.774 10.838 10.850 10.763 10.842   10.946        
B3LYP 10.640 11.158 11.158 11.070 10.982 10.945 11.015 11.056 11.012 10.904 11.008 11.011 10.906 11.008 11.012 10.973 11.005 11.011 10.973 11.005
B3LYPultrafine   11.158     10.983 10.946 11.015 11.056   10.904 11.008 11.011 10.907 11.009   10.973 11.006   10.973 11.005
B3PW91 10.606 11.159 11.159 11.058 10.957 10.917 10.962 10.973 10.928 10.859 10.918 10.929 10.851 10.920   10.884 10.918   10.885 10.918
mPW1PW91 10.633 11.184 11.184 11.079 10.966 10.922 10.969 10.976 10.928 10.857 10.917 10.933 10.857 10.922   10.885 10.919   10.886 10.918
M06-2X 10.889 11.400 11.400 11.291 11.166 11.127 11.178 11.182 11.130 11.075   11.129 11.045 11.129   11.077 11.126   11.079 11.125
PBEPBE 10.125 10.747 10.747 10.643 10.571 10.541 10.617 10.655 10.613 10.512 10.612 10.614 10.523 10.611   10.584 10.609   10.584 10.609
PBEPBEultrafine   10.747     10.571 10.542 10.618 10.656   10.511 10.612 10.615 10.522 10.612   10.584 10.609   10.584 10.609
PBE1PBE 10.538 11.123 11.123 11.020 10.902 10.902 10.906 10.915 10.864 10.790 10.851 10.866 10.795 10.855   10.826 10.851   10.826 10.851
HSEh1PBE 10.534 11.112 11.112 11.012 10.897 10.853 10.903 10.914 10.864 10.789 10.853 10.866 10.791 10.857   10.825 10.853   10.825 10.853
TPSSh 10.641 11.155 11.155 11.059 10.963 10.923 10.963 10.960 10.915 10.862 10.911 10.921 10.858 10.913 10.916 10.884 10.910 10.914 10.884 10.909
wB97X-D 10.758 11.323 11.323 11.201 11.091 11.055 11.099 11.102 11.064 10.991 11.051 11.068 10.979 11.054 11.053 11.006 11.051 11.051 11.008 11.051
B97D3 10.348 10.890 10.890 10.788 10.701 10.674 10.741 10.778 10.740 10.647 10.741 10.742 10.646 10.740 10.742 10.703 10.737 10.741 10.704  
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-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2 10.228 11.126 11.126 10.995 10.952 11.119 11.159 11.001 11.153 11.098 11.199 11.139 11.107 11.244 11.272 11.149 11.249 11.277 11.152 11.249
MP2=FULL 10.229 11.127 11.127 10.995 10.945 11.115 11.156 10.999 11.148 11.081 11.189 11.141 11.105 11.262 11.273 11.147 11.257 11.274 11.150 11.248
MP3         10.988   11.181       11.287 11.228 11.154 11.323         11.195  
MP3=FULL   11.147 11.147 11.015 10.983 11.198 11.237 11.043 11.240 11.177 11.277 11.230 11.157 11.344   11.196        
MP4   11.143     10.965       11.223   11.265 11.208 11.160 11.301   11.228 11.302   11.232  
MP4=FULL   11.142     10.959       11.218   11.256   11.162 11.320   11.228 11.311   11.232  
B2PLYP 10.555 11.172 11.172 11.070 10.978 10.997 11.053 11.033 11.045 10.961 11.058 11.041 10.983 11.071   11.035 11.071   11.038 11.070
B2PLYP=FULL 10.555 11.172 11.172 11.070 10.977 10.996 11.052 11.033 11.045 10.957 11.056 11.041 10.983 11.076   11.035 11.074   11.039 11.071
Configuration interaction CID   11.097 11.097 10.958 10.946     10.972     11.127   11.029 11.145         11.058  
CISD   11.075 11.075 10.938 10.929     10.957     11.112   11.013 11.130         11.042  
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-pVDZ daug-cc-pVTZ
Quadratic configuration interaction QCISD   11.091 11.091 10.965 10.954 11.127 11.161 11.008 11.168 11.138 11.222 11.158 11.109 11.245   11.144     11.148  
QCISD(T)         10.918     10.974     11.217 11.159 11.119 11.263   11.159 11.269   11.163  
QCISD(T)=FULL         10.913   11.170       11.210   11.121     11.163 11.266   11.168  
QCISD(TQ)         10.913                              
QCISD(TQ)=FULL         10.909   11.167           11.119              
Coupled Cluster CCD   11.141 11.141 11.008 11.000 11.161 11.196 11.051 11.203 11.173   11.192 11.145 11.280   11.179     11.183  
CCSD         10.961         11.142 11.226 11.161 11.114     11.148     11.151  
CCSD=FULL         10.945           11.230 11.167 11.116 11.287   11.152        
CCSD(T)         10.920 11.132 11.169 10.974 11.181 11.126 11.219 11.161 11.121 11.265   11.161     11.165  
CCSD(T)=FULL         10.915           11.212 11.164 11.123 11.276   11.165 11.268   11.170  
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-pVDZ 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 10.400 10.383 10.495 10.496 10.502 10.504     10.371
density functional BLYP                 10.619
B1B95                 10.840
B3LYP 11.048 10.988 11.120 11.056 11.104 11.099     11.005
B3LYPultrafine                 11.005
B3PW91                 10.919
mPW1PW91                 10.920
M06-2X                 11.128
PBEPBE                 10.609
PBEPBEultrafine                 10.609
PBE1PBE                 10.853
HSEh1PBE                 10.854
TPSSh                 10.909
wB97X-D 11.136 11.074 11.205 11.128 11.193 11.189     11.054
B97D3                 10.736
Moller Plesset perturbation MP2 10.801 10.844 10.937 10.965 10.898 10.901     11.245
MP2=FULL                 11.258
MP3                 11.324
MP3=FULL                 11.335
MP4                 11.303
MP4=FULL                 11.314
B2PLYP                 11.069
B2PLYP=FULL                 11.072
Configuration interaction CID                 11.145
CISD                 11.130
Quadratic configuration interaction QCISD                 11.244
QCISD(T)                 11.262
QCISD(T)=FULL                 11.276
Coupled Cluster CCD                 11.280
CCSD                 11.248
CCSD=FULL                 11.262
CCSD(T)                 11.265
CCSD(T)=FULL                 11.279
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.