IR CAVITY RINGDOWN STUDY OF HOONO FORMATION FROM $OH + NO_{2}$
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Date
2002
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Publisher
Ohio State University
Abstract
The reaction of $OH + NO_{2} \rightarrow HNO_{3}$ is a critical sink of $HO_{x}$ and $NO_{x}$ radicals in the atmosphere. The unstable intermediate HOONO has long been proposed as a minor channel. Because HOONO is predicted to be bound by $<20$ kcal/mol, it would thermally decompose to reactants and would not serve as a sink for OH radicals; hence, its formation would reduce the rate of stable nitric acid formation. We report direct detection of this adduct at $3280cm^{-1}$ by IR cavity ring-down spectroscopy in a discharge flow cell, and present a study of its relative yield and significance in the troposphere and stratosphere.
Description
Author Institution: Chemistry Dept., California Institute of Technology; Jet Propulsion Laboratory, California Institute of Technology