Abstract
Ionizing radiation acts on 3 : 2 KNO/sub 3/--Ca(NO/sub 3/)/sub 2/ glasses to produce a simple hole center, the NO/sub 3/ radical, and an excess electron center, which is probably the NO/sub 3//sup 2 -/ radical. At 297/sup 0/K, 10/sup -6/ s after a 4-ns pulse of radiation a yield of 3.2 +- 0.2 ion pairs is found per 100 eV of absorbed energy. The ion pairs recombine, as observed by following the red absorption of NO/sub 3/ (lambda/sub max/ 615 nm), from 10/sup -6/ to 10/sup 2/ s. Diffusion of the reacting species is involved above the glass transition temperature (T/sub g/ = 341/sup 0/K), while electron tunneling seems to be the main mechanism below T/sub g/. The reaction is weakly temperature dependent (E/sub A/ approximately equal to 3 kcal) from 77 to 260/sup 0/K, but E/sub A/ jumps to approximately 18 kcal above 260/sup 0/K. These results are discussed in terms of modern electron-transfer theories, which predict such a transition from weak to strong activation. Acetate glasses showed no detectable radiation coloration in the visible, and only a small, decaying absorption in the near UV. 2 figures, 37 references.
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