HR: 1340h
AN: A13D-0970    [Abstracts]
TI: Re-determination of the UV Absorption Cross Sections of ClOOCl
AU: * Pope, F D
EM: francis.d.pope@jpl.nasa.gov
AF: Jet Propulsion Laboratory California Institute of Technology, M/S 183-901 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Hansen, J C
EM: jaron.hanson@jpl.nasa.gov
AF: Jet Propulsion Laboratory California Institute of Technology, M/S 183-901 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Bayes, K D
EM: kyle.d.bayes@jpl.nasa.gov
AF: Jet Propulsion Laboratory California Institute of Technology, M/S 183-901 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Friedl, R R
EM: randall.r.friedl@jpl.nasa.gov
AF: Jet Propulsion Laboratory California Institute of Technology, M/S 183-901 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Sander, S P
EM: ssander@jpl.nasa.gov
AF: Jet Propulsion Laboratory California Institute of Technology, M/S 183-901 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AB: The UV photolysis of the dimer of chlorine monoxide (ClOOCl) is a fundamental process in the photochemical depletion of polar stratospheric ozone. Previous spectral determinations agree fairly well at shorter wavelengths, but disagree, by up to a factor of five, in the long wavelength region which is most important for modeling stratospheric ozone loss. New experiments in our laboratory involve freezing out the dimer and then evaporating it in a purer state. At wavelengths less than 300 nm, the new cross sections are very similar to the work of Huder and DeMore[1]. These cross sections and those at longer wavelengths, are significantly less than the current JPL recommendation. The implications of the new experimental results with respect to ozone depletion will be discussed. 1. Huder, K.J. and W.B. DeMore, Absorption Cross Sections of the ClO Dimer. J. Phys. Chem., 1995. 99: p. 3905-3908.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0340 Middle atmosphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005