Abstract We report the quantitative measurement of transient species by concentration modulation spectroscopy using a mid-infrared laser operating at 2 . 8 μ m. Transient species were produced by water vapor glow discharge. Direct absorption spectroscopy was used to verify the feasibility of the quantitative measurement of concentration modulation spectroscopy. It was found that concentration modulation spectroscopy was particularly sensitive to excited molecules and fragments molecules produced by parent molecules. Trace OH radical was quantitatively measured using its concentration modulation absorption spectrum with proper calibration.

中文翻译：

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使用浓度调制光谱法定量测量瞬态物质：以 OH 为例

摘要 我们报告了使用 2 的中红外激光器通过浓度调制光谱对瞬态物质进行定量测量。8微米。瞬态物质是由水蒸气辉光放电产生的。直接吸收光谱用于验证浓度调制光谱定量测量的可行性。发现浓度调制光谱对母体分子产生的激发分子和碎片分子特别敏感。使用适当校准的浓度调制吸收光谱定量测量痕量 OH 自由基。