Low-lying excited states of HO2–HONO, HO2–HONO2, and HO2–HO2NO2 complexes

The vertical excitation energies are calculated for the three lowest excited states of HO2 and the HO2–H2O, HO2–HONO, HO2–HONO2, and HO2–HO2NO2 complexes. The first excited state of each complex is found to be similar to HO2, but generally shifted from that of the HO2 monomer. There is also a dependence of the shift on the binding energy of the complex.