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首页> 外文会议>Chemical, biological, radiological, nuclear, and explosives (CBRNE) sensing XII >A two-pulse, pump-probe method for short-range, remote standoff detection of chemical warfare agents
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A two-pulse, pump-probe method for short-range, remote standoff detection of chemical warfare agents

机译：两脉冲泵浦探测方法，用于化学战剂的短距离远程隔离检测

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摘要

We describe a photofragment laser-induced fluorescence (PF-LIF) method that can be applied to the short-range-standoff detection of low-volatility organophosphonate chemical warfare agents (OP-CWAs) on surfaces. It operates by photofragmenting a surface-bound analyte and then actively interrogating a released phosphorous monoxide (PO) fragment using LIF. We demonstrate a single-pulse-pair (pump = 500 μJ @ 266 nm; probe = 20 μJ @ 248 nm) surface detection sensitivity of 30 μg/cm2 for the organophosphonate diisopropyl isothiocyanate phosphonate (DIPP) on aluminum and 210 μg/cm2 for the same analyte on a more porous concrete surface. By detecting the PO photofragment, the method indicates the presence of organophosphonates; however, we show that it also responds to other phosphorouscontaining compounds. Because of its limited specificity, we believe that the method may have most immediate use as a mapping tool to rapidly identify "hotspots" of OP-CWAs. These would then be confirmed using a more specific tool. As one method of confirming the presence of OP-CWAs (and identifying the agent), we demonstrate that the probe beam can be used to acquire Raman-scattering spectra of the target area.
机译：我们描述了一种光致碎裂激光诱导的荧光（PF-LIF）方法，该方法可应用于表面上低挥发性有机膦酸酯化学战剂（OP-CWAs）的短程对峙检测。它通过对表面结合的分析物进行光碎，然后使用LIF主动询问释放的一氧化磷（PO）片段来进行操作。我们证明了单脉冲对（泵= 500μJ@ 266 nm;探针= 20μJ@ 248 nm）表面检测灵敏度为铝上的有机膦酸二异丙基异硫氰酸酯膦酸酯（DIPP）为30μg/ cm2，而铝为210μg/ cm2在多孔混凝土表面上的相同分析物。通过检测PO光致碎裂，该方法表明存在有机膦酸酯。但是，我们表明它也对其他含磷化合物有反应。由于其局限性，我们认为该方法可能最直接用作映射工具，以快速识别OP-CWA的“热点”。然后将使用更特定的工具来确认这些。作为确认OP-CWAs的存在（并识别药物）的一种方法，我们证明了探测光束可用于获取目标区域的拉曼散射光谱。

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