Technical note - Determination of binary gas-phase diffusion coefficients of unstable and adsorbing atmospheric trace gases at low temperature: arrested flow and twin tube method
<p><strong>Abstract.</strong> Gas-phase diffusion is the first step for all heterogeneous reactions under atmospheric conditions. Knowledge of binary diffusion coefficients is important for the interpretation of laboratory studies regarding heterogeneous trace gas uptake and reacti...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
26 Mar 2020
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| In: |
Atmospheric chemistry and physics
Year: 2020, Volume: 20, Issue: 6, Pages: 3669-3682 |
| ISSN: | 1680-7324 |
| DOI: | 10.5194/acp-20-3669-2020 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.5194/acp-20-3669-2020 Verlag, lizenzpflichtig, Volltext: https://www.atmos-chem-phys.net/20/3669/2020/ 
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| Author Notes: | Stefan Langenberg, Torsten Carstens, Dirk Hupperich, Silke Schweighoefer, and Ulrich Schurath |
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| 245 | 1 | 0 | |a Technical note - Determination of binary gas-phase diffusion coefficients of unstable and adsorbing atmospheric trace gases at low temperature |b arrested flow and twin tube method |c Stefan Langenberg, Torsten Carstens, Dirk Hupperich, Silke Schweighoefer, and Ulrich Schurath |
| 246 | 3 | 3 | |a Determination of binary gas-phase diffusion coefficients of unstable and adsorbing atmospheric trace gases at low temperature |
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| 520 | |a <p><strong>Abstract.</strong> Gas-phase diffusion is the first step for all heterogeneous reactions under atmospheric conditions. Knowledge of binary diffusion coefficients is important for the interpretation of laboratory studies regarding heterogeneous trace gas uptake and reactions. Only for stable, nonreactive and nonpolar gases do well-established models for the estimation of diffusion coefficients from viscosity data exist. Therefore, we have used two complementary methods for the measurement of binary diffusion coefficients in the temperature range of 200 to 300 <span class="inline-formula">K</span>: the arrested flow method is best suited for unstable gases, and the twin tube method is best suited for stable but adsorbing trace gases. Both methods were validated by the measurement of the diffusion coefficients of methane and ethane in helium and air as well as nitric oxide in helium. Using the arrested flow method the diffusion coefficients of ozone in air, dinitrogen pentoxide and chlorine nitrate in helium, and nitrogen were measured. The twin tube method was used for the measurement of the diffusion coefficient of nitrogen dioxide and dinitrogen tetroxide in helium and nitrogen.</p> | ||
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