MO KTa mKTb OVGFc DFTd Expte [40] SAC-CI/6-31+G(d)f
8a” 8.96 10.01 8.00 8.32 8.55 8.09
7a” 12.30 11.86 10.73 ncg   10.26
35a’ 12.67 11.16 10.80 ncg   10.75
34a’ 12.95 11.55 11.20 10.13 10.5 10.78
6a” 12.94 12.35 11.14 10.69 10.7 11.32
33a’ 13.79 12.01 11.89 11.29 11.2  
5a” 13.53 12.92 11.80 11.78 11.8  
4a” 15.16 14.09 13.51 13.07    
32a’ 17.24 14.93 15.13 ncg    
3a” 16,17 14.89 14.36 14.04    
31a’ 17.67 15.23 15.55 14.47    
2a” 17.87 16.09 15.77 15.29    
30a’ 18.05 15.51 15.90 15.34    
29a’ 18.89 16.53 16.68 ncg    
27a’ 19.53 17.49 17.56 15.65    
28a’ 19.14 16.89 16.97 16.34    
1a” 19.30 17.23 16.90 16.44    
26a’ 20.79 18.25 18.42 17.81    
25a’       18.66    
24a’       19.82    
23a’       20.82    
22a’       21.46    
aKoopmans’ theorm /6-311+G(d,p) [41]
bmeta-Koopmans’ theorm(SAOP)/et-pVQZ
cOuter-valence Green’s function/6-311+(d,p)
dΔPBE0(SAOP)/et-pVQZ
eDougherty et al. [40]
fFarrokhpour and Ghandehari [41]
gNo convergence
Table 5: Vertical ionization energies (in eV) of uric acid vapor.