Abstract
The presence of ``free sodium'' in NaCl crystals containing color centers and color center precursors, as indicated by the results of Hacskaylo and Groetzinger, has been confirmed by the use of a more precise method of chemical analysis. The present measurements were carried out by dissolving the crystals in question in a solution containing an indicator, p-nitrophenol, and determining the resulting change in the optical density of the solution at a wavelength of 415 mμ. The ratio of the number of ``free sodium'' atoms to vacancy pairs was about one for crystals which had been subjected to electrolysis and about one-tenth for crystals irradiated with x-rays, independent of whether these crystals had been first subjected to electrolysis.
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