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<article language="en">
	<journal>
		<journal_title>Atmospheric Chemistry and Physics Discussions</journal_title>
		<journal_url>www.atmos-chem-phys-discuss.net</journal_url>
		<issn>1680-7367</issn>
		<eissn>1680-7375</eissn>
		<volume_number>10</volume_number>
		<issue_number>2</issue_number>
		<publication_year>2010</publication_year>
	</journal>
	<doi>10.5194/acpd-10-2321-2010</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/10/2321/2010/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/10/2321/2010/acpd-10-2321-2010.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/10/2321/2010/acpd-10-2321-2010.pdf</fulltext_pdf>
	<start_page>2321</start_page>
	<end_page>2356</end_page>
	<publication_date>2010-02-01</publication_date>
	<article_title content_type="html">Enhancing effect of dimethylamine in sulfuric acid nucleation in the presence of water –  a computational study</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>V. Loukonen</name>
			<email>ville.loukonen@helsinki.fi</email>
		</author>
		<author numeration="2" affiliations="1">
			<name>T. Kurtén</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>I. K. Ortega</name>
		</author>
		<author numeration="4" affiliations="1">
			<name>H. Vehkamäki</name>
		</author>
		<author numeration="5" affiliations="2">
			<name>A. A. H. Pádua</name>
		</author>
		<author numeration="6" affiliations="3">
			<name>K. Sellegri</name>
		</author>
		<author numeration="7" affiliations="1">
			<name>M. Kulmala</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Department of Physics, P.O. Box 64, 00014 University of Helsinki, Finland</affiliation>
		<affiliation numeration="2" content_type="html">Department of Chemistry, Université Blaise Pascal, Clermont-Ferrand, 24 avenue des Landais, 63177 Aubière, France</affiliation>
		<affiliation numeration="3" content_type="html">Department of Physics, Université Blaise Pascal, Clermont-Ferrand, 24 avenue des Landais, 63177 Aubière, France</affiliation>
	</affiliations>
	<abstract content_type="html">We have studied the hydration of sulfuric acid – ammonia and sulfuric acid – dimethylamine
      clusters using quantum chemistry. We calculated the formation energies and thermodynamics
      for clusters of one ammonia or one dimethylamine molecule together with 1–2 sulfuric acid
      and 0–5 water molecules. The results indicate that dimethylamine enhances the addition of
      sulfuric acid to the clusters much more efficiently than ammonia when the number of water
      molecules in the cluster is either zero, or greater than two. Further hydrate distribution
      calculations reveal that practically all dimethylamine-containing two-acid clusters will
      remain unhydrated in tropospherically relevant circumstances, thus strongly suggesting that
      dimethylamine assists atmospheric sulfuric acid nucleation much more effectively than
      ammonia.</abstract>
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