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Kinetics of CH Radical Reactions Important to Hydrocarbon Combustion Systems

  • J. E. BUTLER
    J. E. BUTLER
    Chemistry Division, Naval Research Laboratory, Washington, D.C. 20375
    More by J. E. BUTLER
  • J. W. FLEMING
    J. W. FLEMING
    Chemistry Division, Naval Research Laboratory, Washington, D.C. 20375
  • L. P. GOSS
    L. P. GOSS
    Chemistry Division, Naval Research Laboratory, Washington, D.C. 20375
    More by L. P. GOSS
  • , and 
  • M. C. LIN
    M. C. LIN
    Chemistry Division, Naval Research Laboratory, Washington, D.C. 20375
    More by M. C. LIN
DOI: 10.1021/bk-1980-0134.ch033
    Publication Date (Print):September 23, 1980
    Copyright © 1980 AMERICAN CHEMICAL SOCIETY.
    Laser Probes for Combustion Chemistry
    Chapter 33pp 397-401
    ACS Symposium SeriesVol. 134
    ISBN13: 9780841205703eISBN: 9780841207097

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    Abstract

    One of the important hydrocarbon combustion reaction intermediates is the CH radical. Although CH chemiluminescence (A2Δ → X2π) has been observed in many hydrocarbon flames, the mechanism of CH formation and its reaction kinetics have been difficult to unravel in situ due to the low steady-state concentrations and the complex nature of combustion reactions. This project was undertaken to investigate a means of CH radical production and to study its reactions with various important species so that an overall picture of the oxidation processes, particularly with regard to the mechanism of NOx formation, may be better understood.

    Production and Detection

    One of the most effective methods of CH production is the multiphoton dissociation of CHBr3(1). A high-power ArF excimer laser (193 nm) was used to dissociate a CHBr3:Ar gas mixture (∼1:105) slowly flowing through the reaction cell at pressures of 30-100 torr. A high-power tunable dye laser pumped by a

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