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. Biogenic volatile organic compounds (BVOCs) are intenselyemitted by forests and crops into the atmosphere. During the night, theyreact very rapidly with the nitrate radical ( NO3 ), leading to theformation of a variety of functionalized products including organic nitratesand to large amounts of secondary organic aerosols (SOAs). Organic nitrates(ONs) have been shown not only to play a key role in the transport of reactivenitrogen and consequently in the ozone budget but also to be importantcomponents of the total organic-aerosol mass, while SOAs are known to play a directand indirect role in the climate. However, the reactivity of BVOCs with NO3 remains poorly studied. The aim of this work is to provide newkinetic and mechanistic data for two monoterpenes ( C10H16 ), α - and γ -terpinene, through experiments in simulationchambers. These two compounds, which have very similar chemical structures,have been chosen in order not only to overcome the lack of experimental data but also tohighlight the influence of the chemical structure on the reactivity. Rate constants have been measured using both relative and absolute methods.They were found to be ( 1.2 ± 0.5 ) × 10 - 10 and ( 2.9 ± 1.1 ) × 10 - 11  cm 3  molecule −1  s −1 for α - and γ -terpinene respectively. Mechanistic studies havealso been conducted in order to identify and quantify the main reactionproducts. Total organic nitrate and SOA yields have been determined. Whileorganic nitrate formation yields appear to be similar, SOA yields exhibitlarge differences with γ -terpinene being a much more efficientprecursor of aerosols. In order to provide explanations for this difference, chemical analysis of the gas-phase products was performed at the molecular scale. Detected products allowed for proposing chemical mechanisms and providing explanations through peroxy and alkoxy reaction pathways.

atmospheric chemistry and physics

A comparative and experimental study of the reactivity with nitrate radical of two terpenes: &amp;lt;i&amp;gt;α&amp;lt;/i&amp;gt;-terpinene and &amp;lt;i&amp;gt;γ&amp;lt;/i&amp;gt;-terpinene