The optical and paramagnetic absorption spectra of MgO:Mn single crystals irradiated in a reactor

Abstract

The optical and paramagnetic absorption spectra of MgOiMn crystals of different origin, irradiated in a reactor, have been investigated. It is found that, in spite of only a small amount of Mn-"'" impurity ions in the investigated crystals, their infiuence on the efficiency of formation and accumulation of F+-centers i.s dominant. The dependence of the number of F"* -centers both on irradiation dose and on manganese concentration is studied.

Radiation-induced alterations of MgO: IR absorption spectra in wide interval of wave numbers

“…For these crystals being close both by content of impurity ions and character of radiation alterations of optical (electronic) and paramagnetic [10] absorptions, the abovementioned dependence is linear with good accuracy. Such result evidences community of corresponding centers, responsible for absorption of these bands.…”

“…(2) In crystals of this group ESR signals from trivalent paramagnetic ions were not registered, although they usually actively participated in radiation processes. (3) In these crystals, unlike AB and R2, there are much more Mn 2+ impurity ions, which significantly affect the accumulation process of radiation structural defects [2,10,11].…”

Influence of post‐radiation deformation on TSL and absorption spectra of irradiated MgO crystals

“…While Fe 3+ ions, appearing after (Fe 2+ → Fe 3+ ), are "perturbed" by their surroundings, meaning the broadening of the corresponding EPR line; on the contrary, in the case of two-valence manganese ions (Mn 2+ ), the width of the EPR line narrows. In our opinion, the thing is that, before making the plastic deformation of the sample, the lattice near these ions is already strongly deformed (let us recall the large dimension of the Mn 2+ ion [7]). The postradiation deformation aggravated the disturbance around the ions of two-valence manganese, i.e.…”