一种针对气相化学反应动力学的快速空间色散频率梳状光谱仪

Allen_928

A rapid, spatially dispersive frequency comb spectrograph aimed at gas phase chemical reaction kinetics

正文部分：

来源：Molecular Physics https://www.tandfonline.com/doi/full/10.1080/00268976.2020.1733116

发表时间：2020-08-17

Frances C. Roberts a, H. J. Lewandowski a,b, Billy F. Hobson a and Julia H. Lehman a
aSchool of Chemistry, University of Leeds, Leeds, UK; bJILA and Department of Physics, University of Colorado and the National Institute of Standards and Technology, Boulder, CO, USA

摘要：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 μs 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.

关键词：Frequency combs; chemical kinetics; trace gas detection