Abstract
The optical and thermal stability of the optical absorption spectrum and thermoluminescence (TL) of as-cleaved MgO samples subjected to ionizing radiation at room temperature has been studied. UV irradiation leads to V-center formation when light is absorbed in the Fe 3+ absorption bands. Under subsequent illumination in the V-band, Fe 3+ ions are again formed. X or γ irradiation increase the Fe 3+ band (4.3 eV) to a saturation value and produce the V band. The same three glow peaks at ~ 93,175 and 220°C are observed in X, γ or UV irradiated samples. Two maxima at ≈ 4.3 and 5.1 eV are found in the TL excitation spectrum. It is suggested that, as expected, cation vacancies charge compensate for the Fe 3+ ions. Charge and excitation transfer between both hole and electron traps and the impurity activators Fe, Cr, Mn and Ni determine the observed TL emission.
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