Thermo- and photostimulated luminescence in LiF : Mg, Ti single crystals irradiated by ions and VUV light
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A coordinated study of the relaxation of optical absorption induced by vacuum ultraviolet radiation, x-rays, and α-particles, as well as of photo- and thermostimulated luminescence (TSL) of LiF : Mg, Ti crystals (TLD-100) in the 295–750-K interval, has revealed that TSL regions characterized by activation energies E a = 2.2–2.4 eV and anomalously high frequency factors p 0 = 1021–1022 s−1 alternate with regions where E a = 1.5 eV and p 0 = 1012–1014 s−1. The relative intensities of the TSL peaks produced by UV illumination (10–17 eV) differ strongly under the conditions of selective photon-induced generation of anion excitons, free electrons and holes, or near-impurity electronic excitations. The latter are responsible for the high efficiency of tunneling radiative (involving titanium centers) or nonradiative (involving hydroxyl ions) recombination. The analysis of TSL peaks of LiF: Mg, Ti and LiF took into account two-step processes, namely, thermal dissociation of three-fluorine F 3 − molecules and recombination of the products of their decay (V K and V F centers, H interstices).
PACS numbers61.72.jn 78.60.Kn 78.55.Fv
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