非桥氧空穴中心的发光作为α-石英粒子辐照的标志
Luminescence of non-bridging oxygen hole centers as a marker of particle irradiation of α-quartz
摘要：
在用于发光测年和环境剂量测定的石英晶体中观察到的600 nm-700 nm区域的“红色”发射带的起源仍有争议。它们的光谱和寿命特性通常与玻璃态二氧化硅中的氧悬挂键（“非桥接氧空穴中心，NBOHC”）相似。石英晶体中这些“表面自由基型”中心的存在需要具有高度无序的局部结构的位点，从而形成具有玻璃状SiO2结构特征的纳米空隙。这些位置被引入核粒子（α辐射、中子、离子）的径迹中。在电子的情况下，它们仅在接近非晶化阈值的大剂量（> 5GGy）下产生。本研究报告的比较NBOHC光致发光在合成石英和石英玻璃照射中子或2.5 MeV的电子，并建议，红色NBOHC光致发光带石英可作为一个选择性的标记暴露于粒子辐照。它的寿命在5-25 μs范围内，低温光谱中的特征振动结构和在~620 nm处的共振激发带的存在，使它与其它红区发光带区别开来。
英文摘要：
The origin of the "red" emission bands in the 600 nm-700 nm region, observed in quartz crystals used for luminescence dating and environmental dosimetry, is still controversial. Their reported spectral and lifetime characteristics are often similar to those of oxygen dangling bonds ("non-bridging oxygen hole centers, NBOHCs") in glassy silicon dioxide. The presence of these "surface radical type" centers in quartz crystal requires sites with highly disordered local structure forming nano-voids characteristic to the structure of glassy SiO2. Such sites are introduced in the tracks of nuclear particles (α-irradiation, neutrons, ions). In case of electrons they are created only at large doses (>5 GGy), approaching amorphization threshold. This study reports a comparison of NBOHC photoluminescence in synthetic quartz and silica glass irradiated by neutrons or 2.5 MeV electrons, and suggests that the red NBOHC photoluminescence band in quartz may serve as a selective marker of an exposure to particle irradiation. It can be distinguished from other red-region luminescence bands by lifetimes in 5-25 μs range, characteristic vibrational structures in the low-temperature spectra and presence of resonance excitation band at ~620 nm.
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