Abstract
A new absorption band appears when LiF containing small amounts of magnesium is irradiated by gamma rays. This band is very broad, extending from the F-band out to 600 mμ, and is somewhat unstable thermally at room temperature. It appears when the magnesium ions are precipitated as well as when they are dispersed, although the behavior is slightly different in the two cases. An interpretation in terms of F−2 molecules stabilized by proximity of magnesium ions is given. When LiF containing magnesium is irradiated by neutrons at 350°C, a band peaking near 225 mμ is observed in place of the F-band. This band is similar to a band previously reported at 222 mμ by several workers, but these experiments are the first to show that its occurrence is definitely associated with the presence of magnesium. It is tentatively suggested that this band may be a Z-band, analogous to Z-bands in, e.g., KCl:Sr.
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