A novel small-ratio relative-rate technique for measuring OH formation yields from the reactions of O{sub 3} with alkenes in the gas phase, and its application to the reactions of ethene and propene
- Univ. of California, Los Angeles, CA (United States)
The reactions of ozone with alkenes in the gas phase produce a complex set of stable and radical products. Several recent studies have provided evidence that these reactions lead to the direct production of OH radicals. Organic peroxy radicals (RO{sub 2}) are likely to accompany the production of OH. OH and RO{sub 2} radical formation from these reactions has a significant impact on the atmospheric chemistry of urban and rural air. A small-ratio relative-rate technique to derive OH yields from O{sub 3} reactions with alkenes is described. OH tracer compounds--aromatic and aliphatic hydrocarbons--are added to O{sub 3}-alkene mixtures in small quantities. Under these conditions, a large fraction of the tracer is consumed, resulting in a large signal that allows accurate determination of OH formation yields. Analytical approximations, numerical analysis, and sources of random and systematic uncertainties are discussed. This method is applied to measuring the OH formation yield from the O{sub 3} reaction with propene and ethene, finding 0.35 {+-} 0.07 and 0.18 {+-} 0.06, respectively.
- OSTI ID:
- 343563
- Journal Information:
- Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Vol. 103, Issue 13; Other Information: PBD: 1 Apr 1999
- Country of Publication:
- United States
- Language:
- English
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