Abstract
Absorption bands attributed to nitrogen—oxygen radiolytic fragments in pure NaNO3 and KNO3, grew much more slowly when crystals containing 0.4 ion % of Ag+ were irradiated with x or γ rays at 77°K. Competition between Ag+ and other species for available low-energy electrons was indicated in the silver-doped crystals by growth of an absorption band attributable to silver atoms. Radiation-induced absorbance above 300 mμ in pure NaNO3 and KNO3, and its response to optical bleaching, is shown to be explicable in terms of Gaussian absorption bands arising from three radiation-produced electron-excess centers. Observed results, including correlations between the centers and their resistance to annealing at 300°K, can be accounted for by proposing NO22—, NO32—, and N2O32— as the identities of the electron-excess species.
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