Nitroexplosives detection: from basic science to detection at a distance

M. Gónzalez, C. Peroza, S. Hernández, M. Castro
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引用次数: 1

Abstract

In this contribution, we summarize our efforts toward detection of TNT, from traces to bulk amounts, based on the absorption fingerprint of TNT. Light absorption by TNT is broken into three regions: (1) VIS light absorption by TNT, and (2) formation and detection of NO2 upon UV irradiation of TNT and (3) formation and detection of NO following UV absorption by NO2. The absorption spectrum of TNT powder and particles has been determined from spectral analysis of backscattered VIS light in traditional optical and near field optical microscopy measurements, respectively. The smallest amount of TNT detected in the near field measurements is 7 fg. The absorption spectra of TNT are rich in structure and similar to the one measured for gas phase NO2, with lines due to rovibronic coupling of electronic excited states. Measurements of the backscattered visible light on samples, placed about 5 to 10 meters from the laser source, indicate a clear change in intensity as compared to samples containing TNT. The second light absorption region, NO2 is detected upon UV irradiation of solid TNT.
硝基炸药探测:从基础科学到远距离探测
在这篇文章中,我们总结了我们在TNT的吸收指纹检测方面所做的努力,从痕量到大量。TNT对光的吸收分为三个区域:(1)TNT对可见光的吸收;(2)TNT紫外线照射后NO2的形成和检测;(3)NO2紫外线吸收后NO的形成和检测。利用传统光学和近场光学显微镜测量的背向散射可见光光谱分析,分别确定了TNT粉末和TNT颗粒的吸收光谱。在近场测量中检测到的最小TNT量为7 fg。TNT的吸收光谱结构丰富,与气相NO2的吸收光谱相似,有电子激发态的振动耦合谱线。在距离激光源约5至10米的地方,对样品进行背散射可见光的测量表明,与含有TNT的样品相比,其强度有明显变化。第二个光吸收区,NO2是在固体TNT紫外线照射下检测的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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