Skip to Main content Skip to Navigation
Journal articles

Design and performance of an E-band chirped pulse spectrometer for kinetics applications OCS – He pressure broadening

Abstract : Product channel-specific reaction kinetics at low temperature presents a significant challenge for both experiment and theory but provides essential inputs for astrochemical models of cold interstellar environments. Reaction kinetics studies using chirped pulse Fourier transform microwave (CP-FTMW) spectroscopy provide a potential solution but require the use of a buffer gas to thermalize the reactants and products; however, collisions with the buffer gas reduce the length of the detected signal, the free induction decay, through pressure broadening. The effect of this on time domain signals is largely unexplored using CP-FTMW spectrometers. A new E-band (60–90 GHz) spectrometer has been constructed using previously unavailable equipment in order to maximize its performance for detecting molecules in collisional environments. The design of this spectrometer is described in detail. The pressure broadening of OCS in He was used to test the spectrometer under collisional conditions similar to those that are routinely used to perform reaction kinetics measurements. The corresponding pressure broadening coefficients for transitions in this frequency range were determined at room temperature and the performance of the spectrometer was assessed in relation to recently reported chirped pulse in uniform flow experiments. © 2020
Document type :
Journal articles
Complete list of metadatas

Cited literature [63 references]  Display  Hide  Download

https://hal-univ-rennes1.archives-ouvertes.fr/hal-02638438
Contributor : Laurent Jonchère <>
Submitted on : Friday, May 29, 2020 - 2:20:31 PM
Last modification on : Wednesday, September 23, 2020 - 3:16:37 PM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2020-11-17

Please log in to resquest access to the document

Identifiers

Citation

Brian M. Hays, Théo Guillaume, Thomas Hearne, Ilsa R. Cooke, Divita Gupta, et al.. Design and performance of an E-band chirped pulse spectrometer for kinetics applications OCS – He pressure broadening. Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2020, 250, pp.107001. ⟨10.1016/j.jqsrt.2020.107001⟩. ⟨hal-02638438⟩

Share

Metrics

Record views

53