Abstract

OH molecules in the burnt gases of a methane–air flame are excited to individual rotational levels of the v′ = 0 level of the. A²∑⁺ state using a tunable pulsed laser. Some of the laser-excited molecules undergo upward collisional energy transfer to v′ = 1 before radiating. A measurement of the ratio of the populations in these two vibrational levels, together with an estimate of the relative rates of vibrational transfer and quenching and the invocation of detailed balancing, furnishes the temperature of the flame. The method should be suitable for the single-pulse simultaneous measurement of the temperature and the concentration of OH, a reactive intermediate species.

© 1980 Optical Society of America

Picosecond planar laser-induced fluorescence measurements of OH A² Σ⁺ (ν′ = 2) lifetime and energy transfer in atmospheric pressure flames

Frank C. Bormann, Tim Nielsen, Michael Burrows, and Peter Andresen
Appl. Opt. 36(24) 6129-6140 (1997)

Thermally assisted fluorescence of laser-excited OH A²Σ⁺ as a flame diagnostic tool

A. A. Neuber, J. Janicka, and E. P. Hassel
Appl. Opt. 35(21) 4033-4040 (1996)

Picosecond laser-induced fluorescence measurement of rotational energy transfer of OH A²Σ⁺ (v′ = 2) in atmospheric pressure flames

Tim Nielsen, Frank Bormann, Michael Burrows, and Peter Andresen
Appl. Opt. 36(30) 7960-7969 (1997)

Energy transfer processes in CH A²Δ and B²Σ⁻ in an atmospheric pressure flame

Nancy L. Garland and David R. Crosley
Appl. Opt. 24(23) 4229-4237 (1985)

Laser excitation dynamics of OH in flames

Calvin Chan and John W. Daily
Appl. Opt. 19(8) 1357-1367 (1980)