Study of peroxy radical autoxidation using cavity ring-down spectroscopy Edward Bates and Rabi Chhantyal-Pun University of Nottingham, UK Peroxy radicals are key intermediates in the oxidation of volatile organic compounds (VOCs) which can be emitted into the atmosphere from biogenic and anthropogenic sources. The peroxy radicals produced from biogenic VOCs, such as isoprene, play an important role in the atmosphere by controlling the oxidising capacity and initiating processes such as aerosol formation. The oxidation pathways of biogenic peroxy radicals have been suggested to be significantly enhanced through autoxidation processes which involve intramolecular hydrogen transfer. It is not fully understood how this process has impacted tropospheric oxidation pathways in the past, and also going forward in the net-zero carbon emissions future. We aim to fully understand the peroxy radical chemistry in such atmospheres by using a combination of laser flash photolysis and cavity ring-down spectroscopy (CRDS). The initial construction of the CRDS apparatus and preliminary results will be presented.
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