Origin of OH Chemiluminescence during the Induction Period of the H2–O2 Reaction behind Shock Waves

The intensity and the rate of increase of light emitted by the OH* 2Σ+→2II(0–0) transition were studied during the induction period behind shock waves in 5% H2—95% air mixture. Induction-zone temperatures ranged from about 1000° to 1900°K, and the initial pressure was 10 Torr. A standard lamp was us...

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Bibliographic Details
Published in:The Journal of chemical physics 1964-01, Vol.40 (2), p.415-422
Main Authors: Belles, F. E., Lauver, M. R.
Format: Article
Language:eng ; jpn
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Summary:The intensity and the rate of increase of light emitted by the OH* 2Σ+→2II(0–0) transition were studied during the induction period behind shock waves in 5% H2—95% air mixture. Induction-zone temperatures ranged from about 1000° to 1900°K, and the initial pressure was 10 Torr. A standard lamp was used to calibrate the optical system, so that photomultiplier signals could be transformed to OH* concentration. The results are interpreted in terms of radical-recombination reactions. It is found that OH* is formed in the reaction H+O2+H2→H2O+OH* and is effectively quenched, in these experiments, only by water. The excitation process is an inefficient reaction, with an average rate constant of 2×105 liter2/mole2·sec.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1725129