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Thermal grating and broadband degenerate four-wave mixing spectroscopy of OH in high-pressure flames

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∑–X2Π(0,0) band of OH has been studied in premixed methane/air flames using a cw Ar+ laser probe. Measurements of flame temperature and pressure were derived from fits of theoretical simulations to the observed time variation of signals over a pressure range of 10 to 40 bar and for different stoichiometry that were in agreement with independent measurements using N2 CARS and predictions of a one-dimensional flame calculation. Broadband DFWM spectra in the same band of OH were observed up to a pressure of 9 bar, above which signals were obtained only from scattering from thermal gratings.

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Authors and Affiliations

  1. Physikalisch Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, , , , , , DE

    H. Latzel, A. Dreizler & T. Dreier

  2. DLR, Institut f. Physikalische Chemie der Verbrennung, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany, , , , , , DE

    J. Heinze, M. Dillmann & W. Stricker

  3. Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU, UK (E-mail: p.ewart@physics.oxford.ac.uk), , , , , , UK

    G.M. Lloyd & P. Ewart

Authors
  1. H. Latzel
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  2. A. Dreizler
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  3. T. Dreier
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  4. J. Heinze
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  5. M. Dillmann
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  6. W. Stricker
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  7. G.M. Lloyd
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  8. P. Ewart
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Received: 10 November 1997/Revised version: 28 May 1998

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Latzel, H., Dreizler, A., Dreier, T. et al. Thermal grating and broadband degenerate four-wave mixing spectroscopy of OH in high-pressure flames . Appl Phys B 67, 667–673 (1998). https://doi.org/10.1007/s003400050563

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  • DOI: https://doi.org/10.1007/s003400050563

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