Thermoluminescence and electron spin resonance after room-temperature X-ray irradiation of NaCl:Mn2+ |
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Authors: | F.J. López F. Jaque A.J. Fort F. Agulló-López |
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Affiliation: | Departamento de Optica y Estructura de la Materia and Instituto de Física del Estado Sólido C.S.I.C., Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain |
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Abstract: | A parallel investigation of thermoluminescence (TL) and electron spin resonance (ESR) spectra on room-temperature (RT) X-irradiated NaCl:Mn2+ has been performed. The TL spectra in the range 20–300°C consist of five glow peaks, numbered from I to V. Temperatures at maximum height are 41°, 68°, 118°, 152° and 216°C, respectively. Peaks I, II and IV obey first-order kinetics, whereas peaks III and V fit second-order behavior. The wavelength spectrum for all glow peaks consists of two bands centered at 595 and 400 nm. The 595 nm emission is attributed to hole capture by Mn+ and subsequent deexcitation of Mn2+. The 400 nm emission is produced as a consequence of hole-F center recombination.The correlation of TL glow peaks to various defects has been investigated. Peak II is clearly related to manganese-vacancy dipoles and peak I can be roughly associated to free cation vacancies. Peak IV appears to relate to large Mn-aggregates, whereas peak V is intrinsic and not related to impurities.On the other hand, ESR data indicate that each glow peak in the 595 nm emission is associated to the annihilation of a given Mn-center; Peak I to Mn0C, peak II to Mn0C and Mn+, peak III to Mn+ and peaks IV and V to Mn0-D. |
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