HR: 1340h
AN: A53C-0904    [Abstracts]
TI: Chemistry and Photochemistry of NO$_{y}$ in Thin Water Films Using a Newly Designed Apparatus
AU: * Ramazan, K A
EM: kramazan@uci.edu
AF: University of California, Irvine, 506 Rowland Hall, Irvine, CA 92697
AU: Wingen, L M
EM: wingenit@uci.edu
AF: University of California, Irvine, 506 Rowland Hall, Irvine, CA 92697
AU: Finlayson-Pitts, B J
EM: bjfinlay@uci.edu
AF: University of California, Irvine, 506 Rowland Hall, Irvine, CA 92697
AB: A 102-L borosilicate glass reaction cell has been equipped to measure both gas phase chemistry as well as the chemistry in thin surface films simultaneously. Two spectroscopic methods are combined in this unique apparatus. Gases are measured with long path Fourier transform infrared spectroscopy (FTIR), while an attenuated total reflectance (ATR) FTIR probe can measure the changes in the composition of thin water films. This system has been applied to the heterogeneous hydrolysis of nitrogen dioxide as well as the photolysis of surface nitric acid, which has been proposed to be a source of HONO. Results from these studies and their atmospheric implications will be discussed.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting