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Behr et al. 2001
Behr, P., Morris, J.R., Antman, M.D., Ringeisen, B.R., Splan, J.R. and Nathanson, G.M. (2001). Reaction and desorption of HCl and HBr following collisions with supercooled sulfuric acid. Geophysical Research Letters 28: doi: 10.1029/2000GL012716. issn: 0094-8276.

Gaseous HCl and HBr react with sulfuric acid at rates that depend strongly on acid concentration over a range of acidities typical of stratospheric aerosols. We monitor the competition between immediate desorption and H→D exchange after HCl and HBr thermalize upon collision with the surface of deuterated sulfuric acid: the exchange probabilities decrease from 0.7 to 0.1 (HCl) and 0.9 to 0.2 (HBr) as the acid concentration is increased from 55 to 70 wt % D2SO4 at 213 K. These measurements imply that HCl and HBr desorb faster than they dissociate at higher acidities, impeding the formation of Cl- and Br- in more acidic aerosols. Residence time measurements of HCl molecules that do enter the acid, however, indicate that HCl is more soluble than expected at high sulfuric acid concentrations. ¿ 2001 American Geophysical Union

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Abstract

Keywords
Atmospheric Composition and Structure, Chemical kinetic and photochemical properties
Journal
Geophysical Research Letters
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Publisher
American Geophysical Union
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