Electron Traps in Deformed Alkali Halide Crystals

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Abstract
Additively colored KBr and KCl crystals were deformed at room temperature, illuminated with F light at −140° and −120°C, respectively, to produce F′ centers and then warmed from −186°C to room temperature. Absorption spectra were obtained at a series of temperatures during warming. Curves of absorption in the region of the F′ band vs temperature showed two temperature regions in which the absorbance decreased rapidly, corresponding to the decomposition of two sets of centers of differing thermal stability. Undeformed crystals displayed only one such temperature region, in which ordinary F′ centers were destroyed. The centers in deformed crystals may be F′ centers whose stability is either increased or decreased by the influence of neighboring dislocations. In deformed KCl a new center, absorbing near 1500 mμ and more stable thermally than F′ centers, was found.

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