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Calculated Electron Affininty for O2 (Oxygen diatomic)

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Experimental Electron Affinity is 0.451 ± 0.007 eV
Please note! These calculated electron affinity 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

Electron Affinities in eV
Methods with predefined basis sets
composite G2 0.499
G3 0.434
G3B3 0.399
G3MP2 0.403
G4 0.463
CBS-Q 0.498

Electron Affinities 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 cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ
hartree fock HF -6.786 -1.222 -1.222 -0.583 -1.435 -1.435 -0.727 -1.358 -1.358 -1.603   -0.955 -1.584 -1.280 -1.115 -0.813 -0.876 -0.906 -1.280 -0.818 -0.879
ROHF   -0.983 -1.360 -0.308 -1.143 -1.143 -0.466 -1.084 -1.604       -1.309 -0.993 -1.429 -1.133 -1.214 -1.246   -0.559 -0.617
density functional LSDA -6.441 -0.766 -0.766 0.376 -0.185 -0.185 1.047 0.150 0.150 -0.293   0.735 -0.360 0.369   1.008 1.015   0.369 1.040 1.050
BLYP -6.864 -1.426 -1.426 -0.235 -0.772 -0.772 0.577 -0.448 -0.448 -0.889   0.217 -0.945 -0.189   0.551 0.554   -0.189 0.592 0.603
B1B95 -6.462 -1.004 -1.004 0.729 -0.720 -0.720 0.291 -0.508 -0.508 -0.846   0.003 -0.878 -0.334   0.239 0.220   -0.216 0.250 0.229
B3LYP -6.399 -0.961 -0.961 0.086 -0.526 -0.526 0.622 -0.263 -0.263 -0.655   0.317 -0.693 -0.055 0.192 0.574 0.564 0.546 -0.055 0.587 0.575
B3LYPultrafine   -0.962     -0.526 -0.526 0.622 -0.263       0.317 -0.693 -0.055   0.574 0.564     0.587 0.575
B3PW91 -6.405 -0.869 -0.869 0.085 -0.553 -0.553 0.458 -0.320 -0.320 -0.682   0.176 -0.706 -0.158   0.407 0.384   -0.158 0.420 0.396
mPW1PW91 -6.385 -0.852 -0.852 0.065 -0.593 -0.593 0.406 -0.378 -0.378 -0.725   0.110 -0.743 -0.224   0.355 0.321   -0.200 0.365 0.331
M06-2X -6.289 -0.663 -0.663 0.164 -0.535 -0.535 0.386 -0.293 -0.293 -0.666 0.313 0.214 -0.700 -0.084   0.316 0.403     0.319 0.402
PBEPBE -6.876 -1.290 -1.290 -0.195 -0.775 -0.775 0.466 -0.489 -0.489 -0.887   0.118 -0.927 -0.261   0.446 0.442   -0.261 0.493 0.501
PBEPBEultrafine   -1.291     -0.775 -0.775 0.466 -0.489       0.118 -0.927 -0.260   0.446 0.442     0.493 0.501
PBE1PBE -6.511 -0.929 -0.929 -0.001 -0.667 -0.667 0.347 -0.454 -0.454 -0.795   0.058 -0.813 -0.285   0.301 0.277     0.312 0.287
HSEh1PBE -6.511 -0.925 -0.925 0.008 -0.654 -0.654 0.369 -0.435 -0.435 -0.786   0.086 -0.807 -0.265   0.318 0.293     0.328 0.302
TPSSh -6.591 -0.972 -0.972 0.010 -0.613 -0.613 0.428 -0.374 -0.374 -0.743   0.133 -0.769 -0.206 0.014 0.386 0.360 0.350   0.404 0.381
wB97X-D -6.363 -0.838 -0.838 0.083 -0.532 -0.532 0.465 -0.333 -0.333 -0.669   0.137 -0.705 -0.200 0.015 0.395 0.337 0.306   0.401 0.339
B97D3 -6.664 -1.199 -1.199 -0.188 -0.774 -0.774 0.379 -0.514 -0.514 -0.890 0.282 0.038 -0.921 -0.324 -0.080 0.353 0.323 0.309   0.394 0.573
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 cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ
Moller Plesset perturbation MP2 -8.098 -1.964 -1.964 -0.558 -0.907 -0.907 0.124 -0.860 -0.860 -0.850   -0.251 -1.181 -0.351 0.020 0.195 0.317 0.360 -0.351 0.203 0.322
MP2=FULL -8.098 -1.963 -1.963 -0.556 -0.907 -0.907 0.123 -0.859 -0.859 -0.854   -0.248 -1.181 -0.367 0.020 0.195 0.291 0.358 -0.367 0.202 0.297
ROMP2 -8.093 -2.233 -2.233 -0.912 -1.178 -1.178 -0.080 -1.093 -1.093 -1.117   -0.459 -1.426 -0.606   0.002       0.009 0.123
MP3         -0.799   -0.998         -0.247 -1.085 -0.339           0.158 0.254
MP3=FULL         -0.801   0.109         -0.244 -1.086 -0.360           0.156 0.222
MP4   -1.700     -0.886       -0.846     -0.214 -1.160 -0.342   0.291 0.392     0.303 0.399
MP4=FULL   -1.700     -0.888       -0.846       -1.160 -0.361   0.290 0.360     0.301 0.367
B2PLYP -6.980 -1.323 -1.323 -0.163 -0.725 -0.725 0.394 -0.543 -0.543 -0.798   0.058 -0.923 -0.243   0.387 0.413     0.395 0.419
B2PLYP=FULL -6.980 -1.323 -1.323 -0.162 -0.726 -0.726 0.394 -0.543 -0.543 -0.799   0.059 -0.923 -0.248   0.387 0.405     0.395 0.410
B2PLYP=FULLultrafine         -0.726                       0.405        
Configuration interaction CID   -1.406 -1.406 -0.328 -0.901     -0.884                       -0.016 0.039
CISD   -1.435 -1.435 -0.344 -0.927     -0.906                       -0.009 0.032
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 cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ
Quadratic configuration interaction QCISD   -1.510 -1.510 -0.323 -0.849 -0.849 0.195 -0.818 -0.818 -0.812   -0.220 -1.122 -0.361   0.253 0.317   -0.361 0.268 0.325
QCISD(T)         -0.861     -0.825       -0.199 -1.137 -0.338   0.295 0.390     0.305 0.397
QCISD(T)=FULL         -0.863   0.207           -1.138 -0.358 0.034 0.293 0.357 0.409   0.303 0.364
QCISD(TQ)         -0.859   0.196           -1.136 -0.340 0.030 0.276 0.371 0.397      
QCISD(TQ)=FULL         -0.861                     0.274 0.338        
Coupled Cluster CCD   -1.461 -1.461 -0.296 -0.811 -0.811 0.130 -0.786 -0.786 -0.768   -0.224 -1.085 -0.332   0.172 0.266     0.177 0.269
CCSD         -0.843         -0.805   -0.223 -1.117 -0.358 -0.017 0.220 0.295 0.317   0.228 0.300
CCSD=FULL         -0.845         -0.811   -0.221 -1.117 -0.378 -0.020 0.218 0.262 0.310   0.226 0.267
CCSD(T)         -0.857 -0.857   -0.823 -0.823 -0.794   -0.200 -1.135 -0.337 0.037 0.286 0.383 0.410 -0.337 0.299 0.391
CCSD(T)=FULL         -0.859             -0.199 -1.135 -0.356 0.035 0.285 0.350 0.404 -0.356 0.297 0.358
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 cc-pV(T+d)Z daug-cc-pVDZ daug-cc-pVTZ

Electron Affinities 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 -0.211 -0.991 -0.224 -0.984 -0.333 -0.333     -1.079
density functional B3LYP 0.597 0.041 0.643 0.122 0.473 0.465     0.229
PBEPBE                 0.038
wB97X-D 0.524 -0.031 0.583 0.057 0.367 0.361      
Moller Plesset perturbation MP2 -0.069 -0.372 0.013 -0.276 -0.139 -0.136     -0.077
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.