HR: 1330h
AN: A32B-0137    [PDF]
TI: Design and Characterization of an Apparatus for Studying the Kinetics and Mechanisms of Heterogeneous Reactions in the Atmosphere
AU: * Ramazan, K A
EM: kramazan@uci.edu
AF: University of California Irvine, Department of Chemistry Rowland Hall, Irvine, Ca 92626
AU: Wingen, L M
EM: wingenit@uci.edu
AF: University of California Irvine, Department of Chemistry Rowland Hall, Irvine, Ca 92626
AU: Finlayson-Pitts, B J
EM: bjfinlay@uci.edu
AF: University of California Irvine, Department of Chemistry Rowland Hall, Irvine, Ca 92626
AB: A 102-L borosilicate glass reaction cell was designed to measure both gas phase chemistry as well as the chemistry in thin surface films simultaneously. Long path Fourier transform infrared spectroscopy (FTIR) is used to measure gas phase species while an attenuated total reflectance (ATR) FTIR probe is used to measure the changes in the composition of the thin water film at the same time during heterogeneous reactions. This system has been used to study the heterogeneous hydrolysis of NO$_{2}$. Three species (NO$_{2}$, NO, and HONO) were monitored in the gas phase, while surface-adsorbed HNO$_{3}$, N$_{2}$O$_{4}$ and other species were measured in the thin film of water adsorbed on the ATR crystal. This apparatus includes a quartz lamp tube so photolysis reactions can be studied. The details of the system, specifications, and the chamber characterization will be presented.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0345 Pollution--urban and regional (0305)
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting