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A kinetic study of the Vaidya hydrocarbon flame bands emitted in the O–C2H2 reaction has been performed in a conventional fast-flow system at about 300°K. The effect of the free-radical scavengers NO and O2, as well as various other additives, has been studied. The emitter appears to have a direct precursor which is formed in the reaction sequence before the direct precursors of the other near-ultraviolet and visible-light emitters and the chemi-ions. Previously suggested mechanisms for formation of the Vaidya band emitter are critically evaluated. The reactions O+CH2(X3Σg−, vibrationally excited)→CHO*+H and/or O+C2H2O*→CHO*+CHO best explain the results.
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Arthur Fontijn (1966) studied this question.
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