Ultraviolet-light excitation of thermochemically reduced MgAl₂{O}₄$ single crystals below room temperature produces a luminescence band with a peak at 2.69 eV. The excitation spectrum of the 2.69-eV band coincides with the broad F-center absorption band at 5.30 eV. The 2.69-eV band is also emitted in uv-stimulated glow peaks which occur at 95 and 265 K. A photoconductivity maximum is observed at 5.39 eV at temperatures above 160 K, but the band is readily bleached by uv light.
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Bandyopadhyay et al. (1985) studied this question.
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