A rapid, spatially dispersive frequency comb spectrograph aimed at gas phase chemical reaction kinetics
A rapid, spatially dispersive frequency comb spectrograph aimed at gas phase chemical reaction kinetics
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DOI：
10.1080/00268976.2020.1733116
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发表时间：
2020-02-27
影响因子：
1.7
通讯作者：
Lehman, Julia H.
中科院分区：
文献类型：
--
作者：
Roberts, Frances C.;Lewandowski, H. J.;Lehman, Julia H.
本文将重点介绍直接红外吸收频率梳激光光谱在高灵敏度气体检测方面的一些最新进展，重点介绍频率梳在化学反应动力学中的应用以及我们在这一领域的贡献。我们最近实现的检测技术使用12.9 GHz自由光谱范围虚拟成像相控阵和衍射光栅的组合，将中红外频率梳状波空间分散到相机上。单个频率或250 MHz重复频率梳的“梳齿”能够被分辨出来。通过使用Herriott多通细胞增加相互作用路径长度来实现高分子灵敏度。高光谱分辨率，宽带光谱覆盖和高分子灵敏度都可以在可调的1-50 μ s时间尺度上实现，使该频率梳仪器成为测量化学反应动力学的理想选择，可以同时监测多个吸收物质。这篇New Views文章还将讨论化学家在自己的实验室中实施这种先进物理技术时可能面临的一些挑战和决定。空间分散的250兆赫中红外频率梳状激光，某些频率被稀释的甲烷样品吸收。
This New Views article will highlight some recent advances in high sensitivity gas detection using direct infrared absorption frequency comb laser spectroscopy, with a focus on frequency comb use in chemical reaction kinetics and our own contribution to this field. Our recently implemented detection technique uses a combination of a 12.9 GHz free spectral range virtually imaged phased array and diffraction grating to spatially disperse the mid-infrared frequency comb onto a camera. Individual frequencies or 'comb teeth' of a 250 MHz repetition-rate frequency comb are able to be resolved. High molecular sensitivity is achieved by increasing the interaction path length using a Herriott multipass cell. High spectral resolution, broadband spectral coverage, and high molecular sensitivity are all achieved on an adjustable 1-50 mu s timescale, making this frequency comb apparatus ideal for measuring chemical reaction kinetics where multiple absorbing species can be monitored simultaneously. This New Views article will also discuss some of the challenges and decisions that chemists might face in implementing this advanced physics technology in their own laboratory. Spatially dispersed 250 MHz mid-infrared frequency comb laser, with absorption of some frequencies by a dilute sample of methane.