Single-crystal electron spin resonance studies on radiation-produced species in ice Ih. Part 1.—The O– radicals

Abstract

The X-band e.s.r. spectra were recorded at 4 K for single crystals of hexagonal D₂O ice gamma-irradiated at 77 K. From the measurements at 4 K the g tensors as well as the direction cosines were determined for O^– radicals formed from OD radicals upon cooling. There are two sets of O^– radicals derivable directly from three sets of OD radicals trapped in ice I_h. The sp² hybridization of valence orbitals for O^– radicals is consistent with anisotropic g tensors.