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Thermal grating and broadband degenerate four-wave mixing spectroscopy of OH in high-pressure flames |
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| Authors: | H. Latzel A. Dreizler T. Dreier J. Heinze M. Dillmann W. Stricker G.M. Lloyd P. Ewart |
| Affiliation: | Physikalisch Chemisches Institut, Universit?t Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany, DE DLR, Institut f. Physikalische Chemie der Verbrennung, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany, DE Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU, UK (E-mail: p.ewart@physics.oxford.ac.uk), UK |
| Abstract: | 2 ∑–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. Received: 10 November 1997/Revised version: 28 May 1998 |
| Keywords: | PACS: 42.62.Fi 84.40.Py |
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