Time-resolved mid-infrared dual-comb spectroscopy
Time-resolved mid-infrared dual-comb spectroscopy
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DOI：
10.1038/s41598-019-53825-8
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发表时间：
2019-11-21
影响因子：
4.6
通讯作者：
Khodabakhsh, Amir
中科院分区：
文献类型：
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作者：
Abbas, Muhammad A.;Pan, Qing;Khodabakhsh, Amir
双梳光谱技术可以在短时间内提供宽光谱带宽和高光谱分辨率，从而实现时间分辨测量。具体地说，中红外波长范围内的光谱是特别感兴趣的，因为大多数分子在这个“指纹”区域具有最强的旋转-振动跃迁。在这里，我们报告的时间分辨中红外双梳光谱，覆盖类似的300 nm带宽约3.3 μ m，6 GHz的光谱分辨率和20 μ s的时间分辨率。作为示范，我们研究了CH 4/He气体混合物中的放电，而放电调制之间的黑暗和辉光制度。我们同时监测C2 H6的生产和CH 4分子的振动激发，观察这两个过程的动力学。这种宽带、高分辨率和时间分辨中红外光谱的方法为监测快速化学反应的动力学提供了一种新的工具，在物理化学和等离子体/燃烧分析等各个领域具有潜在的应用。
Dual-comb spectroscopy can provide broad spectral bandwidth and high spectral resolution in a short acquisition time, enabling time-resolved measurements. Specifically, spectroscopy in the mid-infrared wavelength range is of particular interest, since most of the molecules have their strongest rotational-vibrational transitions in this "fingerprint" region. Here we report time-resolved mid-infrared dual-comb spectroscopy, covering similar to 300 nm bandwidth around 3.3 mu m with 6 GHz spectral resolution and 20 mu s temporal resolution. As a demonstration, we study a CH4/He gas mixture in an electric discharge, while the discharge is modulated between dark and glow regimes. We simultaneously monitor the production of C2H6 and the vibrational excitation of CH4 molecules, observing the dynamics of both processes. This approach to broadband, high-resolution, and time-resolved mid-infrared spectroscopy provides a new tool for monitoring the kinetics of fast chemical reactions, with potential applications in various fields such as physical chemistry and plasma/combustion analysis.