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Volume 119, 2002
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Energy transfer in combustion diagnostics: Experiment and modeling

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Laser induced fluorescence (LIF) of OH (A2Σ+) is measured in several atmospheric-pressure flames using a short-pulse laser system (80 ps duration) in conjunction with an intensified streak camera. The two-dimensional signal-detection technique allows one to simultaneously monitor rotational and vibrational relaxation as well as electronic quenching. Rotationally-resolved LIF spectra affected by energy transfer are compared with the results of a rate-equation model and are found to be in reasonably good agreement. It is shown that a significant contribution of fluorescence detected by broad-band techniques is due to levels populated by vibrational energy transfer (VET). Implications for picosecond LIF techniques for the time-resolved, quench-free detection of OH are discussed. A detailed analysis is presented for fluorescence spectra originating from levels populated by VET after excitation of states in the OH (A2Σ+, [italic v (to differentiate from Times ital nu)]′ = 2) level.

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The article was received on 05 Mar 2001 and first published on 09 Oct 2001

Article type: Paper
DOI: 10.1039/B102058G
Citation: Faraday Discuss., 2002,119, 275-286
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    Energy transfer in combustion diagnostics: Experiment and modeling

    A. Brockhinke and K. Kohse-Höinghaus, Faraday Discuss., 2002, 119, 275
    DOI: 10.1039/B102058G

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