Quantifying methane vibrational and rotational temperature with Raman scattering

T.D. Butterworth (Corresponding author), B. Amyay, D. van den Bekerom, A. van de Steeg, T. Minea, N. Gatti, Q. Ong, C. Richard, C. van Kruijsdijk, J.T. Smits, A.P. van Bavel, V. Boudon, G.J. van Rooij

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This work describes the theoretical basis and implementation of the measurement of vibrational (Tvib) and rotational (Trot) temperatures in CH4 by fitting spontaneous Raman scattering spectra in the Pentad region. This method could be applied for thermal equilibrium temperature measurements applications, e.g. in combustion, or vibrational-rotational non-equilibrium applications, such as in plasma chemistry. The method of calculating these temperatures is validated against known temperature thermal equilibrium spectra up to 860 K from published data, giving an estimated relative error of 10%. This demonstrates that both the calculated stick spectrum and the algorithm to determine Tvib and Trot for CH4 is robust to 860 K, but we expect it is valid to 1500 K. Additionally, a number of non-equilibrium spectra generated with a pulsed microwave plasma are fitted to find Tvib and Trot, further demonstrating the applicability of this method in fitting non-equilibrium spectra.

Original languageEnglish
Article number106562
Number of pages14
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Publication statusPublished - 1 Oct 2019


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