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Flame bands: CO + O chemiluminescence as a measure of gas temperature

Author
Abstract

Carbon monoxide flame band emission (CO+O → CO2+hV) in CO2 microwave plasma is quantified by obtaining absolute calibrated emission spectra at various locations in the plasma afterglow while simultaneously measuring gas temperatures using rotational Raman scattering. Comparison of our results to literature reveals a contribution of O2 Schumann-Runge UV emission at T > 1500 K. This UV component likely results from the collisional exchange of energy between CO2(1B) and O2. Limiting further analysis to T < 1500 K, we demonstrate the utility of CO flame band emission by analyzing afterglows at different plasma conditions. We show that the highest energy efficiency for CO production coincides with an operating condition where very little heat has been lost to the environment prior to ∼3 cm downstream, while simultaneously, T ends up below the level required to effectively freeze in CO. This observation demonstrates that, in CO2 plasma conversion, optimizing for energy efficiency does not require a sophisticated downstream cooling method.

Year of Publication
2021
Journal
Journal of Physics D: Applied Physics
Volume
53
Issue
37
Number of Pages
374005
Date Published
09/2021
DOI
10.1088/1361-6463/ac0924
PId
c31f6476ee4950d53652d6f684ca823b
Alternate Journal
J. Phys. D: Appl. Phys.
Label
OA
Attachment
Journal Article
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