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首页> 外文会议>Conference on Laser Applications to Chemical and Environmental Analysis, Feb 11-13, 2000, Santa Fe, New Mexico >NO Detection by Cavity Ringdown Laser Spectroscopy
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NO Detection by Cavity Ringdown Laser Spectroscopy

机译：腔衰荡激光光谱检测NO

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摘要

Rapid detection and precise analysis of explosives in the environment is playing an increasingly important role in the modern world: for example, in criminal investigations of bombings, in detection of explosive materials concealed in mail or in airline baggage, in detection of soils and/or groundwater polluted by explosive materials. Spectroscopic methods can provide high selectivity and sensitivity for explosive detection. Because of their low vapor pressure, very sensitive detection is needed. Cavity Ringdown Laser Spectroscopy (CRDLS) is the most suitable technique for this purpose. The basic principles of CRDLS are presented in Reference 4. The absorption spectra of most nitro explosives dissolved in ethanol lie in the UV spectral region (210-260 nm), due to an n→π~* electronic transition primarily associated with the nitro group. Unfortunately, the mirrors available for this region have relatively poor reflectivities (Fig.l), limiting the detection sensitivity (Table 1). In spite of relatively low of UV-CRDLS detection sensi-tivity, a few works have appeared in the last five years. Recent rapid progress in mirror coating technology permits hope for further decreasing mirror losses. As an initial step in our effort to measure gas-phase 2,4,6-trinitrotoluene (TNT) by means of UV-CRDLS, we have investigated UV-CRDLS detection of NO. Nitric oxide was chosen for study because (1) it has a well-known absorption spectrum in the appropriate spectral region for testing and optimizing the experimental setup and (2) since UV-detection of TNT usually involves photo-fragmentation of TNT and subsequent production of NO, the effect NO on the UV-CRDLS signal of TNT will need to be taken into account in our future investigations.
机译：快速检测和精确分析环境中的爆炸物在现代世界中发挥着越来越重要的作用：例如，在爆炸案的刑事调查中，在邮件或航空行李中隐藏的爆炸物检测中，土壤和/或检测中爆炸物污染的地下水。光谱方法可以为爆炸物检测提供高选择性和灵敏度。由于它们的蒸气压低，因此需要非常灵敏的检测。腔衰荡激光光谱（CRDLS）是最适合此目的的技术。 CRDLS的基本原理在参考文献4中介绍。由于主要与硝基相关的n→π〜*电子跃迁，大多数溶解在乙醇中的硝基炸药的吸收光谱位于UV光谱区域（210-260 nm）。 。不幸的是，该区域可用的反射镜反射率相对较差（图1），限制了检测灵敏度（表1）。尽管UV-CRDLS的检测灵敏度相对较低，但最近五年出现了一些工作。镜面镀膜技术的最新快速发展为进一步减少镜面损耗提供了希望。作为我们通过UV-CRDLS测量气相2,4,6-三硝基甲苯（TNT）的第一步，我们研究了UV-CRDLS对NO的检测。选择一氧化氮进行研究是因为（1）它在适当的光谱区域中具有众所周知的吸收光谱，用于测试和优化实验设置；（2）由于TNT的紫外线检测通常涉及TNT的光碎裂和后续生产从NO的角度来看，在未来的研究中将需要考虑NO对TNT的UV-CRDLS信号的影响。

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