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On the quantification of OH*, CH*, and C2* chemiluminescence in flames

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Abstract

Absolute concentrations of all important chemiluminescent species, OH–A, CH–A, CH–B, and C2-d have been measured for the first time in methane-oxygen flames at low pressure. The optical detection system for chemiluminescence measurements has been calibrated with Rayleigh and Raman scattering of a cw laser, with the latter approach yielding superior results.

The measured ratio between the concentration of CH–B and CH–A suggests that the electronically excited CH* is formed close to thermal equilibrium. Introduction of different rate constants for reactions leading to CH–A and CH–B were not necessary to explain the experimental results. Results are compared with a recent numerical model. Deviations in profile shape and peak positions are relatively small for stoichiometric flames, but become more pronounced in richer mixtures. Larger discrepancies are observed for the absolute concentrations, depending on the chemiluminescent species and the stoichiometry.

In an attempt to find an alternative method for the quantification of chemiluminescent species, MIR-CRDS has been performed around 3.9 μm. While H2O and OH–X could be measured, the sensitivity was not high enough to detect the low sub-ppb concentration of OH–A—in part due to the limited reflectivity of mirrors in the MIR, in part due to a significant background of hot H2O lines.

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Acknowledgements

The authors wish to thank Prof. Dr. Katharina Kohse-Höinghaus for generous support and discussions. We thank Dr. Trupti Kathrotia (DLR Stuttgart) for discussions on the reaction kinetics mechanism of chemiluminescent species. Deutsche Forschungsgemeinschaft (DFG) has funded this work under contracts KO 1363/21-2, PAK 116/1, and 116/2 and SFB 686 TP C5.

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  1. Physikalische Chemie 1, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany

    P. Nau, J. Krüger, A. Lackner, M. Letzgus & A. Brockhinke

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  1. P. Nau
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  2. J. Krüger
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  3. A. Lackner
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  4. M. Letzgus
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  5. A. Brockhinke
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Correspondence to A. Brockhinke.

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Nau, P., Krüger, J., Lackner, A. et al. On the quantification of OH*, CH*, and C2* chemiluminescence in flames. Appl. Phys. B 107, 551–559 (2012). https://doi.org/10.1007/s00340-012-5006-9

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  • DOI: https://doi.org/10.1007/s00340-012-5006-9

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