A weak luminescence emission band at 850 mμ was found in rutile cyrstals, and a series of shallow electron traps (<1 eV) were detected in thermally stimulated current and thermoluminescence curves, both of which show the same eight peaks in the temperature range of −190 to +100°C. These results are characteristic of all samples examined, including crystals from two different sources, crystals having different orientations, and crystals having different amounts of reduction within a limited range.
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Addiss et al. (1968) studied this question.
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