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Methane Sulfonic Acid Enhanced Formation of Molecular Clusters of Sulfuric Acid and Dimethyl Amine : Volume 14, Issue 12 (14/07/2014)

By Bork, N.

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Book Id: WPLBN0003972573
Format Type: PDF Article :
File Size: Pages 23
Reproduction Date: 2015

Title: Methane Sulfonic Acid Enhanced Formation of Molecular Clusters of Sulfuric Acid and Dimethyl Amine : Volume 14, Issue 12 (14/07/2014)  
Author: Bork, N.
Volume: Vol. 14, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Elm, J., Olenius, T., Bork, N., & Vehkamäki, H. (2014). Methane Sulfonic Acid Enhanced Formation of Molecular Clusters of Sulfuric Acid and Dimethyl Amine : Volume 14, Issue 12 (14/07/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: University of Helsinki, Department of Physics, Division of Atmospheric Sciences, P.O. Box 64, 00014 Helsinki, Finland. Over oceans and in coastal regions methane sulfonic acid (MSA) is present in substantial concentrations in aerosols and in the gas phase. We present an investigation of the effect of MSA on sulfuric acid and dimethyl amine (DMA) based cluster formation rates. From systematic conformational scans and well tested ab initio methods, we optimize structures of all MSAx (H2SO4)yDMAz clusters where x + y ≤ 3 and z ≤ 2. The resulting thermodynamic data is used in the Atmospheric Cluster Dynamics Code and the effect of MSA is evaluated by comparing ternary MSA-H2SO4-DMA cluster formation rates to binary H2SO4-DMA cluster formation rates. Within the range of atmospherically relevant MSA concentrations, we find that MSA may increase cluster formation rates by up to one order of magnitude, although typically, the increase will be less than 300% at 258 K, less than 100% at 278 K and less than 15% at 298 K. The results are rationalized by a detailed analysis of the the main growth paths of the clusters. We find that MSA enhanced clustering involves clusters containing one MSA molecule, while clusters containing more than one MSA molecule do not contribute significantly to the growth.

Summary
Methane sulfonic acid enhanced formation of molecular clusters of sulfuric acid and dimethyl amine

Excerpt
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