In Situ Raman Spectroscopy Monitoring of Material Changes During Proton Irradiation
In Situ Raman Spectroscopy Monitoring of Material Changes During Proton Irradiation
复制标题
质子辐照过程中材料变化的原位拉曼光谱监测
DOI：
10.1177/00037028211062943
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发表时间：
2022-02-07
影响因子：
3.5
通讯作者：
Westall, Frances
中科院分区：
文献类型：
--
作者：
Canizares, Aurelien;Foucher, Frederic;Westall, Frances
有机分子是在太阳系其他行星上寻找生命的主要目标。了解它们在离子照射后的保存潜力和可探测性，其影响可能代表在火星或行星际空间中接受数百万至数十亿年的影响，是天体生物学研究的一个关键目标。为了在不久的将来能够在离子辐照下对这类有机分子进行原位表征，用聚合物测试样品进行了可行性实验，以验证光学构型和辐照室几何形状。我们在这里提出了一个拉曼原位研究在质子辐照下一系列聚合物的演变。为了实现这一目标，设计了一种新型的拉曼光学探针，该探针记录了质子辐照（最终通量为3.10(14)）。Cm(-2))导致信号背景电平的增加，这可能是聚合物链的断裂和原子位移在材料中产生缺陷的原因。为了进一步改善设置，微拉曼探针和温度控制的样品支架正在开发中，以提供更高的光谱和空间分辨率（通过减少景深和激光光斑尺寸），以允许拉曼映射以及避免任何热效应。
Organic molecules are prime targets in the search for life on other planetary bodies in the Solar System. Understanding their preservation potential and detectability after ionic irradiation, with fluences potentially representing those received for several millions to billions of years at Mars or in interplanetary space, is a crucial goal for astrobiology research. In order to be able to perform in situ characterization of such organic molecules under ionic irradiation in the near future, a feasibility experiment was performed with polymer test samples to validate the optical configuration and the irradiation chamber geometry. We present here a Raman in situ investigation of the evolution of a series of polymers during proton irradiation. To achieve this goal, a new type of Raman optical probe was designed, which documented that proton irradiation (with a final fluence of 3.10(14) at.cm(-2)) leads to an increase in the background level of the signal, potentially explained by the scission of the polymeric chains and by atom displacements creating defects in the materials. To improve the setup further, a micro-Raman probe and a temperature-controlled sample holder are under development to provide higher spectral and spatial resolutions (by reducing the depth of field and laser spot size), to permit Raman mapping as well as to avoid any thermal effects.