This article spotlights the interest in using co-localized infrared (IR)–Raman spectroscopy as an innovative approach for the in situ monitoring of complex gas mixtures, e.g., hydrogen (H2), nitrogen (N2), carbon monoxide (CO), carbon dioxide (CO2), and methane (CH4), at elevated pressures. Thus, by combining the IR and Raman spectra of CH4, we proposed a new methodology for the calibration of the Raman spectra to circumvent the fact that Raman intensities are arbitrary (laser power, instrument response, integration time, and fluorescence). Applying our methodology to scale several consecutive experiments, the concentrations of all gases were determined with a relative uncertainty lower than 10%. These original results highlight the interest in co-localized IR–Raman spectroscopy analysis in a single cell for the quantitative analysis of solutes by Raman spectroscopy without the use of an internal standard.

中文翻译：

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共定位红外拉曼光谱：高压气体混合物原位定量分析的创新方法

本文重点介绍了使用共定位红外 (IR)-拉曼光谱作为原位监测复杂气体混合物（例如氢气 (H2)）的创新方法的兴趣。2）、氮气（N2）、一氧化碳（CO）、二氧化碳（CO2）和甲烷（CH4），在高压下。因此，通过结合 CH 的红外光谱和拉曼光谱4，我们提出了一种校准拉曼光谱的新方法，以避免拉曼强度是任意的（激光功率、仪器响应、积分时间和荧光）。应用我们的方法来扩展多个连续实验，确定所有气体的浓度，相对不确定度低于 10%。这些原始结果凸显了人们对单细胞共定位红外-拉曼光谱分析的兴趣，以通过拉曼光谱对溶质进行定量分析，而无需使用内标。