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首页> 外文期刊>Applied Spectroscopy >Mid-Infrared Diffuse Reflection of a Strongly Absorbing Analyte on Non-Absorbing and Absorbing Matrices. Part II: Thin Liquid Layers on Powdered Substrates
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Mid-Infrared Diffuse Reflection of a Strongly Absorbing Analyte on Non-Absorbing and Absorbing Matrices. Part II: Thin Liquid Layers on Powdered Substrates

机译：非吸收和吸收基质上强吸收分析物的中红外漫反射。第二部分：粉状基材上的薄液体层

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The average total path length traveled by photons in mid-infrared diffuse reflection spectrometry of powdered potassium chloride matrices coated with a thin layer of silicone oil has been estimated. The average path length of the photons that had passed through the silicone oil layer was first calculated by the application of the Beer–Lambert law. The total path length through the coated particles was then estimated by dividing the path length of the silicone oil by its concentration. The average path length of the photons that had been diffusely reflected from KCl particles with an average diameter of ∼5 μm that had been coated with a very thin layer of the silicone oil (corresponding to a concentration of 0.01% w:w) was estimated to be about 8 mm. This path length was significantly reduced either as the silicone oil concentration or the absorption of the matrix was increased. The result helps to explain why diffuse reflection spectrometry is a far poorer sampling technique for trace analysis when the matrix has strong absorption and why diffuse reflection is not a very promising technique for the standoff detection of nonvolatile chemical warfare agents.
机译：在中红外漫反射光谱法中，估计了涂有硅油薄层的粉状氯化钾基质中光子传播的平均总路径长度。穿过硅油层的光子的平均光程长度首先通过应用比尔-朗伯定律进行计算。然后通过将硅油的路径长度除以其浓度来估算通过涂层颗粒的总路径长度。估算了从平均直径约为5μm的KCl颗粒上扩散的光子的平均光程长度，该平均直径已涂覆有非常薄的硅油层（对应于0.01％w：w的浓度）大约是8毫米随着硅油浓度或基质吸收的增加，该路径长度显着减少。该结果有助于解释为什么当基质具有强吸收性时，漫反射光谱法对于痕量分析而言是一种差得多的采样技术，以及为什么漫反射法不是用于非挥发性化学战剂的对峙检测的非常有前途的技术。

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    《Applied Spectroscopy》 |2008年第4期|383-388|共6页
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