Coloration of CaF_2 by Low Energy Electrons

概要

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Calcium fluoride crystals, which exhibit a weak four band spectrum (Smakula bands) on coloration by X-rays, are found to be colored by low energy electrons (∼10kV) in the temperature range of 150 to 400℃, and show only two bands. A spectrum exhibiting the α and β bands of Mollwo can be produced even at 28℃ if the crystals ate X-rayed prior to electron bombardment. The results are explained by the fact that low energy electrons, because of their short range, can affect a negligibly small number of impurity ions; the effects of trace impurities can, thus, be avoided by this method of coloration. It is, further, concluded that diffusion of neutral fluorine atoms takes place during the electron bombardment and thereby facilitates the formation of F centers. The experiments of the bleaching of X-rayed crystals under electron bombardment also provide supporting evidence for the diffusion of trapped holes (F° atoms).
社団法人日本物理学会の論文
1970-01-05