CO(B 1Σ+→A 1Π) Angstrom System for Gas Temperature Measurements in CO2 Containing Plasmas

Yanjun Du; Keishiro Tamura; Sampson Moore; Zhimin Peng; Tomohiro Nozaki; Peter J. Bruggeman

doi:10.1007/s11090-016-9759-5

CO(B ¹Σ⁺→A ¹Π) Angstrom System for Gas Temperature Measurements in CO₂ Containing Plasmas

Yanjun Du, Keishiro Tamura, Sampson Moore, Zhimin Peng, Tomohiro Nozaki, Peter J. Bruggeman

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

CO₂ containing plasmas are of growing interest for greenhouse gas remediation and dry gas reforming. In this paper, we show that the optical emission spectrum of CO(B-A) transition can be used for gas temperature determination in CO₂ containing plasmas. The study was performed in a packed-bed reactor and compared with previously published results for a MW discharge. The CO emission is mainly produced by direct electron excitation from ground state CO. The rotational temperature is determined by a fitting algorithm of the CO(B-A) (0-1) spectrum and the accuracy of the deduced rotational temperature is shown to be better than 30 K. Meanwhile, we also compared the results with the widely used Boltzmann plots of the CO(B-A) (0-1). The rotational lines corresponding to Q(18–24) yield accurately the gas temperature for spectra with a resolution in excess of 0.05 nm FWHM. Rotational lines with N < 18 cannot be used due to the overlap of rotational lines from different branches unless a spectral resolution of at least 5 pm is used.

Original language	English (US)
Pages (from-to)	29-41
Number of pages	13
Journal	Plasma Chemistry and Plasma Processing
Volume	37
Issue number	1
DOIs	https://doi.org/10.1007/s11090-016-9759-5
State	Published - Jan 1 2017
Externally published	Yes

Bibliographical note

Funding Information:
This work is supported by the University of Minnesota and Tokyo Institute of Technology. S. Moore acknowledges funding from the NSF EAPSI program for US graduate students in Science and Engineering and Y. Du acknowledges funding from the China Scholarship Council. The authors thank T. Silva for providing a CO spectrum from his MW plasma source.

Publisher Copyright:
© 2016, Springer Science+Business Media New York.

Keywords

CO Angstrom system
CO containing plasma
Dielectric barrier discharges (DBD)
Gas temperature determination
Rotational spectroscopy
Spectrum fitting

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title = "CO(B 1Σ+→A 1Π) Angstrom System for Gas Temperature Measurements in CO2 Containing Plasmas",

abstract = "CO2 containing plasmas are of growing interest for greenhouse gas remediation and dry gas reforming. In this paper, we show that the optical emission spectrum of CO(B-A) transition can be used for gas temperature determination in CO2 containing plasmas. The study was performed in a packed-bed reactor and compared with previously published results for a MW discharge. The CO emission is mainly produced by direct electron excitation from ground state CO. The rotational temperature is determined by a fitting algorithm of the CO(B-A) (0-1) spectrum and the accuracy of the deduced rotational temperature is shown to be better than 30 K. Meanwhile, we also compared the results with the widely used Boltzmann plots of the CO(B-A) (0-1). The rotational lines corresponding to Q(18–24) yield accurately the gas temperature for spectra with a resolution in excess of 0.05 nm FWHM. Rotational lines with N < 18 cannot be used due to the overlap of rotational lines from different branches unless a spectral resolution of at least 5 pm is used.",

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AU - Nozaki, Tomohiro

AU - Bruggeman, Peter J.

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AB - CO2 containing plasmas are of growing interest for greenhouse gas remediation and dry gas reforming. In this paper, we show that the optical emission spectrum of CO(B-A) transition can be used for gas temperature determination in CO2 containing plasmas. The study was performed in a packed-bed reactor and compared with previously published results for a MW discharge. The CO emission is mainly produced by direct electron excitation from ground state CO. The rotational temperature is determined by a fitting algorithm of the CO(B-A) (0-1) spectrum and the accuracy of the deduced rotational temperature is shown to be better than 30 K. Meanwhile, we also compared the results with the widely used Boltzmann plots of the CO(B-A) (0-1). The rotational lines corresponding to Q(18–24) yield accurately the gas temperature for spectra with a resolution in excess of 0.05 nm FWHM. Rotational lines with N < 18 cannot be used due to the overlap of rotational lines from different branches unless a spectral resolution of at least 5 pm is used.

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