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- W1981337772 abstract "The optical density of KNO3 crystals was increased from 240 through 1000 mμ by exposure to x or γ-irradiation at 77 or 4.2°K. The increase is accounted for by the growth of seven radiation-induced absorption bands, termed, I, II, III, IV, V, VI and VII. The response of the individual bands to selective optical bleaching was determined. Light which reduced optical absorption bands was also observed to selectively reduce signals in the electron paramagnetic resonance (EPR) spectra of similarly-irradiated KNO3 crystals. These EPR signals had previously been assigned to specific nitrogen-oxygen radicals. A tentative identification of bands I and V with NO−22 band VI with NO3, band VII with NO2, and band III with NO2−3, was made on the basis of correlalations between the EPR and optical response. The known extinction coefficients of NO2−, NO2 etc., together with their measured concentrations, were also considered in making this identification scheme. The response of the optical bands to the selective optical bleaching is accounted for on this scheme by electron release from NO2−2 and capture by NO3 and NOa, hole release from NO2, and photolysis of NO2−3 by 325 mμ light. Molecular orbital descriptions of the species are discussed to deduce approximate positions, Emax, and oscillator strengths, f;, of transitions in the proposed species. The deduced values of Emax are in qualitative agreement with the observed positions of maximum absorbance at 510, 355, 325, 290, 270, 246 and 410 mμ for bands I–VII respectively." @default.
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- W1981337772 date "1962-07-01" @default.
- W1981337772 modified "2023-09-28" @default.
- W1981337772 title "Radiation-induced optical absorption in KNO3 crystals∗" @default.
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- W1981337772 doi "https://doi.org/10.1016/0022-3697(62)90142-7" @default.
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