Observing Chemical Reactions In Low-temperature Supersonic Flows Using Chirped Pulse Fourier Transform Millimeter Wave Spectroscopy

Gupta, Divita

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https://hdl.handle.net/2142/111062 Copy

Description

Title

Observing Chemical Reactions In Low-temperature Supersonic Flows Using Chirped Pulse Fourier Transform Millimeter Wave Spectroscopy

Author(s)

Gupta, Divita

Contributor(s)

• Sims, Ian R.
• Drissi, Myriam
• Hearne, Thomas Sandow
• Abdelkader Khedaoui, Omar
• Cooke, Ilsa Rose
• Hays, Brian M
• Guillaume, Theo

Issue Date

2021-06-23

Keyword(s)

Dynamics and kinetics

Abstract

The CPUF (Chirped Pulse in Uniform Flow) technique has been used previously in pulsed CRESU (Reaction Kinetics in Uniform Supersonic Flow) conditions to observe chemical reactions at low temperatures. We have adapted the technique to the continuous CRESU flows available in Rennes, and have observed the products of photolysis and chemical reactions using a chirped pulse Fourier transform millimeter wave spectrometer. We have characterized the flow conditions suitable for observing products of reactions and provide limits to the performance of these systems. In particular, pressure broadening is found to dominate these measurements, so steps had to be taken to resolve as much of the free induction decays as possible. We also observe the products of chemical reactions, particularly of CN radicals with hydrocarbons. The behavior of these products in CRESU environments as well as the results from these studies will be given and the application to observing the branching ratios of chemical reactions will be discussed.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111062

DOI

10.15278/isms.2021.WC05

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