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首页> 外文期刊>Quaternary geochronology >EPR investigation of the role of germanium centers in the production of the 110 degrees C thermoluminescence peak in quartz
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EPR investigation of the role of germanium centers in the production of the 110 degrees C thermoluminescence peak in quartz

机译：EPR调查锗中心在石英中110摄氏热发光峰的生产中的作用

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摘要

The identification of the center acting as electron source for the well-known 110 degrees C thermoluminescence (TL) peak of quartz is of fundamental importance for practical applications in dating and dosimetry. This TL peak was studied in parallel with the electron paramagnetic resonance (EPR) signal of the [GeO4](-) center on natural colourless quartz irradiated at room temperature. Immediately after irradiation, the signals of the 110 degrees C TL peak and of [GeO4](-) center decay exponentially in the same way, yielding a lifetime of 50.4 +/- 0.9 min at room temperature. Besides, we acquired the isothermal decay curves for the 110 degrees C TL peak and [GeO4](-) center at different temperatures (the samples were held at the selected temperature in the range of 260-308 K). The lifetimes extracted by the isothermal decays were plotted as a function of reciprocal temperature, revealing again the same behavior of the 110 degrees C TL peak and [GeO4](-) center, both characterized by activation energies very close of 0.76 +/- 0.07 eV and 0.77 +/- 0.07 eV, respectively. All results of the present work clearly show the role of electron source of [GeO4](-) center in the emission mechanism of the 110 degrees C TL peak in quartz. (C) 2017 Elsevier B.V. All rights reserved.
机译：作为众所周知的110摄氏度的电子源（TL）峰值的电子源的识别是可以在约会和剂量测定中的实际应用中的基本重要性。该TL峰与在室温下的天然无色石英中的[Geo4]（ - ）中心的电子顺磁共振（EPR）信号并行研究。在照射后立即，110摄氏度峰值和[Geo4]（ - ）中心的信号以相同的方式呈指数衰减，在室温下产生50.4 +/- 0.9分钟的寿命。此外，我们在不同温度下获得了110摄氏度峰值的等温衰变曲线和[Geo4]（ - ）中心（在260-308k的选定温度下保持样品。由等温衰变提取的寿命作为往复温度的函数绘制，再次揭示了110摄氏度峰和[Geo4]（ - ）中心的相同行为，其特征在于激活能量非常接近0.76 +/- 0.07 EV和0.77 +/- 0.07eV分别。目前工作的所有结果都清楚地显示了在石英中110摄氏度峰值的110摄氏度峰的排放机制中的电子源的作用。 （c）2017 Elsevier B.v.保留所有权利。

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