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Mid-infrared spectroscopic investigation of methylamines by a continuous-wave difference-frequency-generation-based system

机译：基于连续波差频发生的系统对甲胺的中红外光谱研究

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A laser spectroscopic system based on a cw difference-frequency generation source with a ratiometric multi-pass absorption detection scheme was employed for high-resolution spectroscopic investigation of gasphase monomethylamine (MMA), dimethylamine (DAM), and trimethylamine (TMA). Possible application of the system as a noninvasive human breath analyzer for renal and liver diseases is targeted. The system operates in the fundamental C-H stretch absorption region around 2740-2860 cm(-1). A detection sensitivity of 2 x 10(-6) cm(-1) Hz(-1/2) (for signal-to-noise ratio SNR = 1) is achieved, corresponding to detection limits of 900 ppb (parts in 10(9)) for MMA, 450 ppb for DMA, and 120 ppb for TMA in mixtures containing H2O and CO2 with concentrations of up to those present in human breath (2% and 5%, respectively). Future developments are discussed to further improve these detection limits that are currently still about 2 orders of magnitude higher than required for direct methylamine monitoring in human breath. (C) 2008 Optical Society of America.
机译：采用基于cw差频发生源和比率式多程吸收检测方案的激光光谱系统对气相单甲胺（MMA），二甲胺（DAM）和三甲胺（TMA）进行高分辨率光谱研究。该系统可能用作肾脏和肝脏疾病的无创性人类呼气分析仪。该系统在2740-2860 cm（-1）附近的基本C-H拉伸吸收区域中运行。实现了2 x 10（-6）cm（-1）Hz（-1/2）的检测灵敏度（对于信噪比SNR = 1），对应于900 ppb的检测极限（以10（ 9））对于MMA，对于DMA为450 ppb，对于TMA为120 ppb，在含有H2O和CO2的混合物中浓度最高达到人呼吸中的浓度（分别为2％和5％）。讨论了进一步改进这些检测限的未来发展，这些检测限目前仍比人呼吸中直接甲胺监测所需的检测限高约两个数量级。 （C）2008年美国眼镜学会。

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