Single-crystal electron spin resonance studies on radiation-produced species in ice Ih. Part 2.—The HO2 radicals

Abstract

X-Band e.s.r. spectra have been recorded at 77 K for single crystals of hexagonal H₂O and D₂O ices irradiated at 77 K and annealed at 150 K. The g and A tensors as well as the direction cosines have been determined for HO₂ and DO₂ radicals formed upon annealing from OH and OD radicals, respectively. It is possible to distinguish three sets of HO₂ and DO₂ radicals derivable directly from three sets of OH and OD radicals trapped in ice I_h.