Bulletin of the Chemical Society of Japan · 1973 · 14 citations · 10 references
Natural SciencesChemistryMaterials ScienceAnalytical ChemistryRadiation PhysicsSpectroscopyGelsHyperfine StructureRadiation ChemistryRadiation Damage In MaterialsRadiation SpectroscopyRotational SpectroscopyIrradiation DamageLinewidth BroadeningRadiation-induced Free Radicals
Abstract Ammonia-silica gel system was γ-irradiated at −196 °C. ESR spectrum observed from samples with low ammonia content showed a marked linewidth anomaly in the hf lines at −196 °C and changed with temperature reversibly. The free radical responsible for the spectrum was assigned to NH2 radical which undergoes a preferential rotation about an axis perpendicular to the radical plane at low temperatures and a substantially free rotation above −90 °C.
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