Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 4 2007 10.5194/acpd-7-10687-2007 http://www.atmos-chem-phys-discuss.net/7/10687/2007/ http://www.atmos-chem-phys-discuss.net/7/10687/2007/acpd-7-10687-2007.html http://www.atmos-chem-phys-discuss.net/7/10687/2007/acpd-7-10687-2007.pdf 10687 10742 2007-07-24 Design of and initial results from a highly instrumented reactor for atmospheric chemistry (HIRAC) D. R. Glowacki A. Goddard K. Hemavibool T. L. Malkin R. Commane F. Anderson W. J. Bloss D. E. Heard T. Ingham M. J. Pilling P. W. Seakins p.w.seakins@leeds.ac.uk School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K. now at: the School of Geography, Earth and Environmental Sciences, University of Birmingham, Egbaston, Birmingham B15 2TT, U.K. The design of a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC) is described and initial results obtained from HIRAC are presented. The ability of HIRAC to perform in-situ laser-induced fluorescence detection of OH and HO₂ radicals with the Fluorescence Assay by Gas Expansion (FAGE) technique establishes it as internationally unique for a chamber of its size and pressure/temperature variable capabilities. In addition to the FAGE technique, HIRAC features a suite of analytical instrumentation, including: a multipass FTIR system; a conventional gas chromatography (GC) instrument and a GC instrument for formaldehyde detection; and NO/NO₂, CO, O₃, and H₂O vapour analysers. Ray tracing simulations and measurements of the blacklamp flux have been utilized to develop a detailed model of the radiation field within HIRAC. Comparisons between the analysers and the FTIR coupled to HIRAC have been performed, and HIRAC has also been used to investigate pressure dependent kinetics of the chlorine atom reaction with ethene and the reaction of O₃ and t-2-butene. 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