Radiation-induced color centers in the near-surface layer of lithium fluoride crystals

Author: Voitovich A.   Kalinov V.   Naumenko N.   Stupak A.  

Publisher: Springer Publishing Company

ISSN: 0021-9037

Source: Journal of Applied Spectroscopy, Vol.73, Iss.6, 2006-11, pp. : 866-873

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Abstract

For radiation-induced intrinsic color centers, we show that the concentrations of identical centers and the concentration ratios of different centers are quite different in the near-surface layer and within the interior volume of a lithium fluoride crystal. We have established that these differences also depend on the sign of the difference between the temperature at which the crystal was irradiated with γ photons and the vacancy mobility temperature. We provide an interpretation for the results obtained, based on the structural features of the near-surface layer and the concentration ratio of vacancies and electrons in the layer, serving as the starting components for color center formation. We found that the concentrations of centers change over the course of a few days by tens of percent in the layer “emerging” from the interior onto the surface as a result of cleavage of the crystal. We measured the luminescence lifetimes of F3 (R2) and F4 centers: 6.6 nsec and 11.7 nsec.

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