Optical Properties of Radiolytic Fragments in Pure and Silverhyphen;Doped NaNO3and KNO3

摘要

Absorption bands attributed to nitrogenmdash;oxygen radiolytic fragments in pure NaNO3and KNO3, grew much more slowly when crystals containing 0.4 ion of Ag+were irradiated with x or ggr; rays at 77deg;K. Competition between Ag+and other species for available lowhyphen;energy electrons was indicated in the silverhyphen;doped crystals by growth of an absorption band attributable to silver atoms. Radiationhyphen;induced absorbance above 300 mmgr; in pure NaNO3and KNO3, and its response to optical bleaching, is shown to be explicable in terms of Gaussian absorption bands arising from three radiationhyphen;produced electronhyphen;excess centers. Observed results, including correlations between the centers and their resistance to annealing at 300deg;K, can be accounted for by proposing NO22mdash;, NO32mdash;, and N2O32mdash;as the identities of the electronhyphen;excess species.