Abstract

Laser-induced fluorescence of the CH radical is used to determine the flame-front temperature of an 8-Torr premixed CH4/O2 flame. The A 2Δ–X 2Π (0, 0) and B 2Σ- - X 2Π (0, 0) bands give values of 1960 ± 60 and 1920 ± 70 K, respectively. This is an improvement over a previous study that found discrepancies up to 20% between these bands. New rotational-level-dependent transition probabilities are the main reason for this improvement. The weaker off-diagonal bands AX (0, 1) and BX (0, 1) yield temperatures of 1930 ± 90 and 1830 ± 100 K, respectively. The influence of rotational transfer on the predissociated levels that have N′ > 14 in B 2Σ-, v′ = 0 was investigated with fluorescence scans and a statistical power-gap law model of the relaxation; deviations up to 8% in temperature can occur because of this process.

© 1999 Optical Society of America

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