ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-10-3099-2010 A new modeling tool for the diffusion of gases in ice or amorphous binary mixture in the polar stratosphere and the upper troposphere Varotsos C. A. 1 Zellner R. 2 Department of Applied Physics, University of Athens, Athens, Greece Institute of Physical Chemistry, University of Duisburg-Essen, Essen, Germany 31 03 2010 10 6 3099 3105 Copyright: © 2010 C. A. Varotsos 2010 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/10/3099/2010/acp-10-3099-2010.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/10/3099/2010/acp-10-3099-2010.pdf

To elaborate stratospheric ozone depletion processes, measurements of diffusion coefficients of selected gas phase molecules (i.e. HCl, CH<sub>3</sub>OH, HCOOH and CH<sub>3</sub>COOH; Katsambas et al., 1997; Kondratyev and Varotsos, 1996; Varotsos et al., 1994, 1995) in ice in the temperature range 170–195 K have been analyzed with respect to the mechanisms and rates of diffusion. It is argued that the diffusion in ice of these compounds is governed by a vacancy – mediated mechanism, i.e. H<sub>2</sub>O vacancies are required to diffuse to lattice sites adjacent to these compounds prior to the diffusion of the corresponding molecule into the vacancy sites. In addition, we show that the diffusion coefficients of these compounds exhibit a specific interconnection, i.e. a linear relationship holds between the logarithm of the pre-exponential factor, <i>D</i><sub>o</sub>, and the activation energy <i>E</i>. The physical meaning of this interconnection is discussed.

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