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A model for heterogeneous chemical processes on the surfaces of ice and nitric acid trihydrate particlesThe study presents a model that incorporates the physics and physical chemistry of ice surfaces relevant to polar stratospheric clouds. Surface concentrations of H2O, HCl, HOCl, ClONO2, and N2O5 on ice and nitric acid trihydrate (NAT) crystals are computed, and surface reaction rates and reaction probabilities (sticking coefficients) are determined. For gas pressures of about 10 exp -7 torr and temperatures in the range of 180-200 K, HCl completely coats ice and water-rich NAT surfaces, while HOCl, ClOHO2, and N2O5 may cover 0.01-1 percent of these surfaces. The energy parameters are used to calculate surface temperatures such as adsorption and desorption constants, surface coverages, reaction rate coefficients, surface diffusion coefficients, and reaction probabilities for various species and chemical interactions on ice and NAT surfaces. Implications for chemical processing on polar stratospheric clouds are discussed.
Document ID
19930065119
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tabazadeh, Azadeh
(NASA Headquarters Washington, DC United States)
Turco, Richard P.
(California Univ. Los Angeles, United States)
Date Acquired
August 16, 2013
Publication Date
July 20, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: D7
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A49116
Funding Number(s)
CONTRACT_GRANT: NGT-30079
CONTRACT_GRANT: NSF ATM-89-11836
CONTRACT_GRANT: NAGW-2183
Distribution Limits
Public
Copyright
Other

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