A photochemical reactor for studies of atmospheric chemistry |
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| Authors: | EJK Nilsson C Eskebjerg MS Johnson |
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| Institution: | 1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing 100029, China;2. Institute of Meteorology and Climate Research, Department of Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Garmisch-Partenkirchen 82467, Germany;3. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics (AIOFM), Chinese Academy of Sciences (CAS), Hefei 230031, China;1. Science & Technology Branch, Environment Canada, 105 McGill st., 7th floor, Montreal, Quebec H2Y 2E7, Canada;2. City of Montreal, Wastewater Treatment Plant, Canada;1. Norwegian Institute for Water Research, Gaustadalléen 21, 0349 Oslo, Norway;2. Department of Biosciences, University of Oslo, Pb. 1066 Blindern, 0316 Oslo, Norway |
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| Abstract: | A photochemical reactor for studies of atmospheric kinetics and spectroscopy has been built at the Copenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometer coupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel end flanges, surrounded by UV-A, UV-C and broadband sun lamps in a temperature-controlled housing. The combination of a quartz vessel and UV-C lamps allows higher concentrations of O(1D) and OH than can be generated by similar chambers. The reactor is able to produce radical concentrations of ca. 8 × 1011 cm?3 for OH, 3 × 106 cm?3 for O(1D), 3.3 × 1010 cm?3 for O(3P) and 1.6 × 1012 cm?3 for Cl. The reactor can be operated at pressures from 10?3 to 103 mbar and temperatures from 240 to 330 K. As a test of the system we have studied the reaction CHCl3 + Cl using the relative rate technique and find kCHCl3+Cl/kCH4+Cl = 1.03 ± 0.11, in good agreement with the accepted value. |
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