The uptake of chlorine dioxide by type II polar stratospheric clouds
- Univ. of Colorado, Boulder, CO (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
We studied the uptake of chlorine dioxide by type II, ice, Polar Stratospheric Clouds with several experimental techniques. The surface coverage of OClO on amorphous ice was studied using a flow tube apparatus. These experiments determined an upper limit to the surface coverage of 2 x 10{sup 9} molec/cm{sup 2} for an OClO concentration of 6 x 10{sup 10} molec/cm{sup 3}. The first order desorption kinetics of OClO from single crystal. ice surfaces was measured in a UHV chamber using temperature programmed desorption. The activation energy for desorption is 23 kJ/mol with a preexponential of 2 x 10{sup 9} s{sup -1}. The sticking coefficient of OClO to amorphous and crystalline ice at 100 K is 0.8 and 0.6 respectively. Using the sticking coefficient and desorption kinetics, equilibrium surface coverages were calculated for OClO on type II PSCs.
- OSTI ID:
- 215131
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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