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- W2049160844 abstract "Recent internal friction and elastic modulus experiments suggest that $F$ centers are formed at dislocations in the alkali halides during x irradiation even at liquid helium temperature, but that enhanced colorability is suppressed at low temperatures by the absence of diffusion of the generated centers. In the present experiments $F$-center growth curves were obtained for both asreceived and plastically deformed (up to 15%) NaCl and KCl crystals at temperatures ranging from 10ifmmode^circelsetextdegreefi{} to 325ifmmode^circelsetextdegreefi{}K. From these data it is found that both the rate of capture of electrons by negative-ion vacancies and the final saturation concentration of $F$ centers achieved are strongly temperature sensitive and that there exists an optimum temperature at which a given color center concentration is attained with a minimum amount of irradiation. The colorability of lightly deformed crystals is found to be enhanced only at temperatures where diffusion of $F$ centers appears to be possible; otherwise a rapid saturation of the coloration is observed. However, the initial $F$-center growth rate in a heavily deformed crystal, relative to an undeformed one, becomes larger as the temperature is decreased, and can be interpreted in terms of the presence of a larger number of $F$ centers formed near dislocations. With further x irradiation, this additional contribution saturates." @default.
- W2049160844 created "2016-06-24" @default.
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- W2049160844 date "1962-04-01" @default.
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- W2049160844 title "Structure Sensitivity ofF-Center Generation by X Rays at Low Temperatures" @default.
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- W2049160844 doi "https://doi.org/10.1103/physrev.126.73" @default.
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