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  • 1
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    Methane sulfonic acid enhanced formation of molecular clusters of sulfuric acid and dimethyl amine (2014)
    Copernicus
    Details
    Publication Date: 2014-07-14
    Description: 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.
    Electronic ISSN: 1680-7375
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 2
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    Methane sulfonic acid-enhanced formation of molecular clusters of sulfuric acid and dimethyl amine (2014)
    Copernicus
    Details
    Publication Date: 2014-11-17
    Description: 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 into 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 optimise the structures of all MSAx (H2SO4)yDMAz clusters where x + y ≤ 3 and z ≤ 2. The resulting thermodynamic data are 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 1 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 rationalised by a detailed analysis of 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.
    Print ISSN: 1680-7316
    Electronic ISSN: 1680-7324
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 3
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    Helmholtz Open Science Forum “Scholar-Led Publishing at Helmholtz” (2023)
    Helmholtz Open Science Office
    In:  Helmholtz Open Science Briefing
    Details
    Publication Date: 2024-03-28
    Description: On April 13, 2023, the Helmholtz Open Science Office, together with the joint Task Group “Open Access Transformation” of the Working Groups Open Science and Library and Information Management organized a Helmholtz Open Science Forum on Scholar-Led Publishing at Helmholtz. Around 100 people registered for participation. The high level of interest in this event indicates its relevance in the ongoing Open Access-Transformation. Diamond Open Access and scholar-led publishing are current buzzwords in this context; focusing on the stronger localization of scientific publishing opportunities in the scientific environment beyond profit- oriented platforms. The first draft of a position statement on scholar-led publishing at Helmholtz, which was developed together with the Task Group Open Access Transformation, was presented at the forum and participants were invited to discuss and comment on it. Presentations and discussions provided insights into various operating models and workflows of external Diamond Open Access journals, service providers and publication services already active in the natural sciences, as well as those operated by Helmholtz Centers. In addition, the EU Commission's perspectives on the further development of the Open Research Europe publication platform were presented.
    Language: English
    Type: info:eu-repo/semantics/report
    Format: application/pdf
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