Abstract
A decrease in the concentration of paramagnetic centers (PMCs) stabilized at 77 K in crystalline hydrogen cyanide was observed when ionizing radiation doses exceeded 3000 kGy. It was assumed that the decrease is due to a change in the physical properties of the matrix as a result of its deformation, loosening, amorphization, and formation of metastable structures. The decay of the PMCs with an increase in temperature of the irradiated samples depends on the dose and type (UV, γ) of the radiation. The higher the dose of preliminary γ-irradiation, the lower the decay temperature. In UV-irradiated HCN, the paramagnetic centers that occur in the thin photolyzed layer are more stable, since they are localized at defect sites of the crystalline matrix, which hinder the migration of free valence.
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