Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC) D. R. Glowacki1, A. Goddard1, K. Hemavibool1, T. L. Malkin1, R. Commane1, F. Anderson1, W. J. Bloss1,*, D. E. Heard1, T. Ingham1, M. J. Pilling1, and P. W. Seakins1 1School of Chemistry, University of Leeds, Leeds LS2 9JT, UK *now at: School of Geography, Earth and Environmental Sciences, University of Birmingham, Egbaston, Birmingham B15 2TT, UK
Abstract. 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; NO/NO2, CO,
O3, and H2O vapour analysers. Ray tracing simulations and NO2
actinometry 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. The results obtained are in good
agreement with literature recommendations and Master Chemical Mechanism
predictions. HIRAC thereby offers a highly instrumented platform with the
potential for: (1) high precision kinetics investigations over a range of
atmospheric conditions; (2) detailed mechanism development, significantly
enhanced according to its capability for measuring radicals; and (3) field
instrument intercomparison, calibration, development, and investigations of
instrument response at a range of atmospheric conditions.
Citation: Glowacki, D. R., Goddard, A., Hemavibool, K., Malkin, T. L., Commane, R., Anderson, F., Bloss, W. J., Heard, D. E., Ingham, T., Pilling, M. J., and Seakins, P. W.: Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC), Atmos. Chem. Phys., 7, 5371-5390, doi:10.5194/acp-7-5371-2007, 2007.