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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1423–1433

Radiative, collisional, and predissociative effects in CH laser-induced-fluorescence flame thermometry

Jorge Luque and David R. Crosley  »View Author Affiliations


Applied Optics, Vol. 38, Issue 9, pp. 1423-1433 (1999)
http://dx.doi.org/10.1364/AO.38.001423


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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 A2Δ–X2Π (0, 0) and B2Σ- - X2Π (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 B2Σ-, 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

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(300.2530) Spectroscopy : Fluorescence, laser-induced

History
Original Manuscript: June 8, 1998
Revised Manuscript: August 28, 1998
Published: March 20, 1999

Citation
Jorge Luque and David R. Crosley, "Radiative, collisional, and predissociative effects in CH laser-induced-fluorescence flame thermometry," Appl. Opt. 38, 1423-1433 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-9-1423

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