Time-, wavelength-, and polarization-resolved measurements of OH (A 2Σ+ ) picosecond laser-induced fluorescence in atmospheric- pressure flames |
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Authors: | A Brockhinke W Kreutner U Rahmann K Kohse-Höinghaus TB Settersten MA Linne |
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Institution: | Physikalische Chemie I, Universit?t Bielefeld, D-33615 Bielefeld, Universit?tsstrasse 25, Germany (Fax: +49-521/106-6027, E-mail: brockhinke@pc1.uni-bielefeld.de), DE Colorado School of Mines, Division of Mechanical Engineering, Golden, CO 80401, USA, US
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Abstract: | Laser-induced fluorescence of OH (A 2Σ+, v’=1) was measured in hydrogen/oxygen and hydrogen/air/nitrogen flames using laser pulses of 80 psec duration. A 2D signal
acquisition scheme simultaneously employed wavelength, temporal, and polarization resolution. The signals emitted in different
rotational branches exhibit polarization-dependent intensities, depending on the rotational branch of the absorption line
used. It is possible to select experimental conditions such that rotational and vibrational relaxation as well as electronic
quenching can be monitored simultaneously. Advantages and limitations of the experimental approach are discussed. Numerical
simulations are presented of the LIF spectra affected by energy transfer.
Received: 29 March 1999 / Revised version: 14 June 1999 / Published online: 27 October 1999 |
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Keywords: | PACS: 06 60 Jn 33 50 j 34 50 Ez 82 40 Py |
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