Abstract

Time-resolved laser-induced fluorescence (LIF) from CO molecules in hydrocarbon flames was studied. Collisional quenching constants were evaluated on the basis of the exponential decays. Effective lifetime in a methane/oxygen flame was observed to vary between 250 and 400 ps depending on the position within the flame, and from 400 to 600 ps in the non-sooty parts of an ethylene/air flame. Fluorescence, constituting simultaneous spatially and temporally resolved decays, was also registered from various sections along a laser beam that probed different parts of the flame. Spectral recordings revealed not only the expected CO peaks but also, in the ethylene flame, laser-induced emission from C₂ Swan bands and from polyaromatic hydrocarbon (PAH) emission that affected the fluorescence time decay in the sooty part of the flame.

Picosecond laser-spectroscopy measurement of hydroxyl fluorescence lifetime in flames

Neal S. Bergano, Paul A. Jaanimagi, Michael M. Salour, and James H. Bechtel
Opt. Lett. 8(8) 443-445 (1983)

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)

Lifetime and collisional quenching measurements of XeF*(B) by photolysis of XeF₂

J. G. Eden and R. W. Waynant
Opt. Lett. 2(1) 13-15 (1978)

Application of 266-nm and 355-nm Nd:YAG laser radiation for the investigation of fuel-rich sooting hydrocarbon flames by Raman scattering

Jan Egermann, Thomas Seeger, and Alfred Leipertz
Appl. Opt. 43(29) 5564-5574 (2004)

Time-resolved CH (A²Δ and B²∑⁻) laser-induced fluorescence in low pressure hydrocarbon flames

Karen J. Rensberger, Mark J. Dyer, and Richard A. Copeland
Appl. Opt. 27(17) 3679-3689 (1988)