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<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACP</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACP</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">Atmos. Chem. Phys.</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7324</issn>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acp-11-4767-2011</article-id>
<title-group>
<article-title>The effect of trimethylamine on atmospheric nucleation involving H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Erupe</surname>
<given-names>M. E.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Viggiano</surname>
<given-names>A. A.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Lee</surname>
<given-names>S.-H.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Kent State University, Department of Chemistry and Biochemistry, Kent, Ohio 44240, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>20</day>
<month>05</month>
<year>2011</year>
</pub-date>
<volume>11</volume>
<issue>10</issue>
<fpage>4767</fpage>
<lpage>4775</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2011 M. E. Erupe et al.</copyright-statement>
<copyright-year>2011</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/3.0/">https://creativecommons.org/licenses/by/3.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://acp.copernicus.org/articles/11/4767/2011/acp-11-4767-2011.html">This article is available from https://acp.copernicus.org/articles/11/4767/2011/acp-11-4767-2011.html</self-uri>
<self-uri xlink:href="https://acp.copernicus.org/articles/11/4767/2011/acp-11-4767-2011.pdf">The full text article is available as a PDF file from https://acp.copernicus.org/articles/11/4767/2011/acp-11-4767-2011.pdf</self-uri>
<abstract>
<p>Field observations and quantum chemical calculations have shown that organic
amine compounds may be important for new particle formation involving
H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;. Here, we report laboratory observations that investigate
the effect of trimethylamine (TMA) on H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;-H&lt;sub&gt;2&lt;/sub&gt;O nucleation
made under aerosol precursor concentrations typically found in the lower
troposphere ([H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;] of 10&lt;sup&gt;6&lt;/sup&gt;&amp;minus;10&lt;sup&gt;7&lt;/sup&gt; cm&lt;sup&gt;−3&lt;/sup&gt;; [TMA] of
180–1350 pptv). The threshold [H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;] needed to produce the
unity &lt;i&gt;J&lt;/i&gt; was from 10&lt;sup&gt;6&lt;/sup&gt;&amp;minus;10&lt;sup&gt;7&lt;/sup&gt; cm&lt;sup&gt;−3&lt;/sup&gt; and the slopes of Log &lt;i&gt;J&lt;/i&gt; vs. Log
[H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;] and Log &lt;i&gt;J&lt;/i&gt; vs. Log [TMA] were 4–6 and 1, respectively,
strikingly similar to the case of ammonia (NH&lt;sub&gt;3&lt;/sub&gt; ternary nucleation
(Benson et al., 2011). At lower RH, however, enhancement in &lt;i&gt;J&lt;/i&gt; due to TMA
was up to an order of magnitude greater than that due to NH&lt;sub&gt;3&lt;/sub&gt;. These
findings imply that both amines and NH&lt;sub&gt;3&lt;/sub&gt; are important nucleation
species, but under dry atmospheric conditions, amines may have stronger
effects on H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt; nucleation than NH&lt;sub&gt;3&lt;/sub&gt;. Aerosol models should
therefore take into account inorganic and organic base compounds together to
fully understand the widespread new particle formation events in the lower troposphere.</p>
</abstract>
<counts><page-count count="9"/></counts>
</article-meta>
</front>
<body/>
<back>
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