显微拉曼光谱技术对射击残留物的有机颗粒研究

发布时间：2018-04-07 17:40

本文选题：有机颗粒　切入点：微观形态　出处：《光谱学与光谱分析》2017年01期

【摘要】：为射击残留物检测提供了一个快速、简便、准确的无损检测方法,通过激光显微拉曼光谱技术对弹药中的发射药及射击残留物中的有机颗粒进行了研究。研究发现,检测射击残留物有机颗粒获得最优拉曼信号的激发波长为473nm,可有效避开荧光干扰。射击残留物有机颗粒主要来自部分燃烧的发射药颗粒,拉曼光谱证明其主要成分与发射药主要成分基本一致,但部分拉曼谱峰强度降低、消失或是线宽变宽,证明其物质结构也在一定程度上受到了破坏。通过微观形态观察,射击残留物有机颗粒表面以铜黄色、灰黑色为主,表面分布熔坑及附着带有金属光泽的球形无机颗粒,这些特有形貌可视为射击残留物的典型特征,成为射击残留物的重要判据。
[Abstract]:A fast, simple and accurate nondestructive detection method was provided for the detection of gunshot residues. The propellant and the organic particles in the gunshot residues were studied by laser micro-Raman spectroscopy.It is found that the excitation wavelength of the optimal Raman signal is 473 nm for the detection of shot residue organic particles, which can effectively avoid the fluorescence interference.The organic particles of the shot residue mainly come from the partially burned propellant particles. The Raman spectra show that the main components are basically consistent with the main components of the propellant, but the intensity of the partial Raman spectra decreases, disappears or the linewidth widens.It is proved that its physical structure has been destroyed to some extent.According to the observation of microscopic morphology, the surface of the organic particles of the gunshot residue is mainly copper yellow, gray and black, the surface distribution pits and the spherical inorganic particles with metallic gloss are distributed on the surface. These unique morphologies can be regarded as the typical characteristics of the shooting residues.It is an important criterion for shooting residue.
【作者单位】：上海市刑事科学技术研究院上海市现场物证重点实验室;上海市公安局物证鉴定中心;
【基金】：国家自然科学基金项目(61405117) 公安部科技计划项目(2015JSYJB06)资助
【分类号】：O657.37;D918.93

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