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<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACPD</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics Discussions</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACPD</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7375</issn>
<publisher><publisher-name>Copernicus GmbH</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acpd-9-15567-2009</article-id>
<title-group>
<article-title>Secondary organic material formed by methylglyoxal in aqueous aerosol mimics &amp;ndash; Part 2: Product identification using Aerosol-CIMS</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Sareen</surname>
<given-names>N.</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>Shapiro</surname>
<given-names>E. L.</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>Schwier</surname>
<given-names>A. N.</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>McNeill</surname>
<given-names>V. F.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Department of Chemical Engineering, Columbia University, New York, NY, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>24</day>
<month>07</month>
<year>2009</year>
</pub-date>
<volume>9</volume>
<issue>4</issue>
<fpage>15567</fpage>
<lpage>15594</lpage>
<permissions>
<license xlink:type="simple">
<license-p>This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
<self-uri xlink:href="http://www.atmos-chem-phys-discuss.net/9/15567/2009/acpd-9-15567-2009.html">This article is available from http://www.atmos-chem-phys-discuss.net/9/15567/2009/acpd-9-15567-2009.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys-discuss.net/9/15567/2009/acpd-9-15567-2009.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/9/15567/2009/acpd-9-15567-2009.pdf</self-uri>
<abstract>
<p>We used chemical ionization mass spectrometry with a volatilization
      flow tube inlet (Aerosol-CIMS) to characterize secondary organic
      material formed by methylglyoxal with ammonium sulfate in aqueous
      aerosol mimics. Bulk reaction mixtures were diluted and atomized to
      form submicron aerosol particles. Organics were detected using
      Aerosol-CIMS in positive and negative ion mode using I&lt;sup&gt;&amp;minus;&lt;/sup&gt; and
      H&lt;sub&gt;3&lt;/sub&gt;O&lt;sup&gt;+&lt;/sup&gt;&amp;middot;(H&lt;sub&gt;2&lt;/sub&gt;O)&lt;sub&gt;&lt;I&gt;n&lt;/I&gt;&lt;/sub&gt; as reagent ions. The results are
      consistent with aldol condensation products, carbon-nitrogen species,
      sulfur-containing compounds, and oligomeric species up to
      759 amu. These results support previous observations by us and
      others that ammonium sulfate plays a critical role in the SOA
      formation chemistry of dicarbonyl compounds.</p>
</abstract>
<counts><page-count count="28"/></counts>
</article-meta>
</front>
<body/>
<back>
<ref-list>
<title>References</title>
<ref id="ref1">
<label>1</label><mixed-citation publication-type="other" xlink:type="simple"> Aiken,~A C., DeCarlo,~P F., Kroll,~J H., Worsnop,~D R., Huffman,~J A., Docherty,~K S., Ulbrich,~I M., Mohr,~C., Kimmel,~J R., Sueper,~D., Sun,~Y., Zhang,~Q., Trimborn,~A., Northway,~M., Ziemann,~P J., Canagaratna,~M R., Onasch,~T B., Alfarra,~M R., Prevot,~A S H., Dommen,~J., Duplissy,~J., Metzger,~A., Baltensperger,~U., and Jimenez,~J L.: O/C and OM/OC ratios of primary, secondary, and ambient organic aerosols with high-resolution time-of-flight aerosol mass spectrometry, Environ. Sci. Technol., 42, 4478–4485, 2008. </mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple"> Anttila,~T., Kiendler-Scharr,~A., Tillman,~R., and Mentel,~T F.: On the reactive uptake of gaseous compounds by organic-coated aqueous aerosols: theoretical analysis and application to the heterogeneous hydrolysis of \chemN_2O_5, J. Phys. Chem. A, 110, 10 435–10 443, 2006. </mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple"> Attygalle,~A B., Garcia-Rubio,~S., Ta,~J., and Meinwald,~J.: Collisionally-induced dissociation mass spectra of organic sulfate anions, J. Chem. Soc., Perkin Trans., 2, 498–506, 2001. </mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple"> Barsanti,~K C. and Pankow,~J F.: Thermodynamics of the formation of atmospheric organic particulate matter by accretion reactions – 2 Dialdehydes, methylglyoxal, and diketones, Atmos. Environ., 39, 6597–6607, 2005. </mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple"> Blake,~R S., Monks,~P S., and Ellis,~A M.: Proton-transfer reaction mass spectrometry, Chem. Rev., 109, 861–896, 2009. </mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple"> Bogan,~M J., Patton,~E., Srivastava,~A., Martin,~S., Fergenson,~D P., Steele,~P T., Tobias,~H J., Gard,~E E., and Frank,~M.: Online aerosol mass spectrometry of single micrometer-sized particles containing poly(ethylene glycol), Rapid Commun. Mass Sp., 21, 1214–1220, 2007. </mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple"> Casale,~M T., Richman,~A R., Elrod,~M J., Garland,~R M., Beaver,~M R., and Tolbert,~M A.: Kinetics of acid-catalyzed aldol condensation reactions of aliphatic aldehydes, Atmos. Environ., 41, 6212–6224, 2007. </mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple"> Cruz,~C N. and Pandis,~S N.: A~study of the ability of pure secondary organic aerosol to act as cloud condensation nuclei, Atmos. Environ., 31, 2205–2214, 1997. </mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple"> De Haan,~D O., Corrigan,~A L., Smith,~K W., Stroik,~D R., Turley,~J J., Lee,~F E., Tolbert,~M A., Jimenez,~J L., Cordova,~K E., and Ferrell,~G R.: Secondary organic aerosol-forming reactions of glyoxal with amino acids, Environ. Sci. Technol., 43, 2818–2824, 2009a. </mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple"> De Haan,~D O., Tolbert,~M A., and Jimenez,~J L.: Atmospheric condensed-phase reactions of glyoxal with methylamine, Geophys. Res. Lett., 36, L11819, doi:10.1029/2009GL037441, 2009b. </mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple"> Denkenberger,~K A., Moffet,~R C., Holecek,~J C., Rebotier,~T P., and Prather,~K A.: Real-time, single-particle measurements of oligomers in aged ambient aerosol particles, Environ. Sci. Technol., 41, 5439–5446, 2007. </mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple"> Duplissy,~J., Gysel,~M., Alfarra,~M R., Dommen,~J., Metzger,~A., Prevot,~A S H., Weingartner,~E., Laaksonen,~A., Raatikainen,~T., Good,~N., Turner,~S F., McFiggans,~G., and Baltensperger,~U.: Cloud forming potential of secondary organic aerosol under near atmospheric conditions, Geophys. Res. Lett., 35, L03818, doi:10.1029/2007GL031075, 2008. </mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple"> Folkers,~M., Mentel,~T F., and Wahner,~A.: Influence of an organic coating on the reactivity of aqueous aerosols probed by the heterogeneous hydrolysis of \chemN_2O_5, Geophys. Res. Lett., 30, 1644–1647, 2003. </mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple"> Fu,~T M., Jacob,~D J., and Heald,~C L.: Aqueous-phase reactive uptake of dicarbonyls as a~source of organic aerosol over eastern North America, Atmos. Environ., 43, 1814–1822, 2009. </mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple"> Galloway, M. M., Chhabra, P. S., Chan, A. W. H., Surratt, J. D., Flagan, R. C., Seinfeld, J. H., and Keutsch, F. N.: Glyoxal uptake on ammonium sulphate seed aerosol: reaction products and reversibility of uptake under dark and irradiated conditions, Atmos. Chem. Phys., 9, 3331–3345, 2009. </mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple"> Gao,~S., Surratt,~J D., Knipping,~E M., Edgerton,~E S., Shahgholi,~M., and Seinfeld,~J H.: Characterization of polar organic components in fine aerosols in the southeastern United States: identity, origin, and evolution, J. Geophys. Res.-Atmos., 111(D14), D14314, doi:10.1029/2005JD006601, 2006. </mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple"> Gomez-Gonzalez,~Y., Surratt,~J D., Cuyckens,~F., Szmigielski,~R., Vermeylen,~R., Jaoui,~M., Lewandowski,~M., Offenberg,~J H., Kleindienst,~T E., Edney,~E O., Blockhuys,~F., Van Alsenoy,~C., Maenhaut,~W., and Claeys,~M.: Characterization of organosulfates from the photooxidation of isoprene and unsaturated fatty acids in ambient aerosol using liquid chromatography/(-)electrospray ionization mass spectrometry, J. Mass Spectrom., 43, 371–382, 2008. </mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple"> Grosjean,~D., Williams,~E L., and Grosjean,~E.: Atmospheric chemistry of isoprene and of its carbonyl products, Environ. Sci. Technol., 27, 830–840, 1993. </mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple"> Hartz,~K E H., Rosenorn,~T., Ferchak,~S R., Raymond,~T M., Bilde,~M., Donahue,~N M., and Pandis,~S N.: Cloud condensation nuclei activation of monoterpene and sesquiterpene secondary organic aerosol, J. Geophys. Res.-Atmos., 110(D14), D14208, 2005. </mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple"> Hearn,~J D., Lovett,~A J., and Smith,~G D.: Ozonolysis of oleic acid particles: evidence for a~surface reaction and secondary reactions involving Criegee intermediates, Phys. Chem. Chem. Phys., 7, 501–511, 2005. </mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple"> Hearn,~J D., Renbaum,~L H., Wang,~X., and Smith,~G D.: Kinetics and Products from a~reaction of Cl radicals with dioctyl sebacate (DOS) particles in \chemO_2: a~model for radical-initiated oxidation of organic aerosols, Phys. Chem. Chem. Phys., 9, 1–11, 2007. </mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple"> Hearn,~J D. and Smith,~G D.: A~chemical ionization mass spectrometry method for the online analysis of organic aerosols, Anal. Chem., 76, 2820–2826, 2004a. </mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple"> Hearn,~J D. and Smith,~G D.: Kinetics and product studies for ozonolysis reactions of organic particles using aerosol CIMS, J. Phys. Chem. A, 108, 10019–10029, 2004b. </mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple"> Hearn,~J D. and Smith,~G D.: Measuring rates of reaction in supercooled organic particles with implications for atmospheric aerosol, Phys. Chem. Chem. Phys., 7, 2549–2551, 2005. </mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple"> Hearn,~J D. and Smith,~G D.: A~mixed-phase relative rates technique for measuring aerosol reaction kinetics, Geophys. Res. Lett., 33, L17805, doi:10.1029/2006GL026963, 2006a. </mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple"> Hearn,~J D. and Smith,~G D.: Reactions and mass spectra of complex particles using Aerosol CIMS, Int. J. Mass Spectrom., 258, 95–103, 2006b. </mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple"> Hearn,~J D. and Smith,~G D.: Ozonolysis of mixed oleic acid/n-docosane particles: the roles of phase, morphology, and metastable states, J. Phys. Chem. A, 111, 11 059–11 065, 2007. </mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple"> Iinuma,~Y., Muller,~C., Berndt,~T., Boge,~O., Claeys,~M., and Herrmann,~H.: Evidence for the existence of organosulfates from beta-pinene ozonolysis in ambient secondary organic aerosol, Environ. Sci. Technol., 41, 6678–6683, 2007. </mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple"> Jang,~M S., Czoschke,~N M., Lee,~S., and Kamens,~R M.: Heterogeneous atmospheric aerosol production by acid-catalyzed particle-phase reactions, Science, 298, 814–817, 2002. </mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple"> Kalberer,~M., Paulsen,~D., Sax,~M., Steinbacher,~M., Dommen,~J., Prevot,~A S H., Fisseha,~R., Weingartner,~E., Frankevich,~V., Zenobi,~R., and Baltensperger,~U.: Identification of polymers as major components of atmospheric organic aerosols, Science, 303, 1659–1662, 2004. </mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple"> King,~S M., Rosenoern,~T., Shilling,~J E., Chen,~Q., and Martin,~S T.: Cloud condensation nucleus activity of secondary organic aerosol particles mixed with sulfate, Geophys. Res. Lett., 34, L24806, doi:10.1029/2007GL030390, 2007. </mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple"> Krizner,~H E., De Haan,~D O., and Kua,~J.: Thermodynamics and kinetics of methylglyoxal dimer formation: a~computational study, J. Phys. Chem. A, 113, 6994–7001, 2009. </mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple"> Kroll,~J H., Ng,~N L., Murphy,~S M., Varutbangkul,~V., Flagan,~R C., and Seinfeld,~J H.: Chamber studies of secondary organic aerosol growth by reactive uptake of simple carbonyl compounds, J. Geophys. Res.-Atmos., 110(D23), D23207, doi:10.1029/2005JD006004, 2005. </mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple"> Lajohn,~L A., Christiansen,~P A., Ross,~R B., Atashroo,~T., and Ermler,~W C.: Abinitio relativistic effective potentials with spin orbit operators .3. Rb Through Xe, J. Chem. Phys., 87, 2812–2824, 1987. </mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple"> Liggio,~J., Li,~S M., and McLaren,~R.: Heterogeneous reactions of glyoxal on particulate matter: identification of acetals and sulfate esters, Environ. Sci. Technol., 39, 1532–1541, 2005a. </mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple"> Liggio,~J., Li,~S M., and McLaren,~R.: Reactive uptake of glyoxal by particulate matter, J. Geophys. Res.-Atmos., 110(D10), D10304, doi:10.1029/2004JD005113, 2005b. </mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple"> Loeffler,~K W., Koehler,~C A., Paul,~N M., and De Haan,~D O.: Oligomer formation in evaporating aqueous glyoxal and methyl glyoxal solutions, Environ. Sci. Technol., 40, 6318–6323, 2006. </mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple"> Lukács, H., Gelencsér, A., Hoffer, A., Kiss, G., Horváth, K., and Hartyáni, Z.: Quantitative assessment of organosulfates in size-segregated rural fine aerosol, Atmos. Chem. Phys., 9, 231–238, 2009. </mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple"> McNeill,~V F., Wolfe,~G M., and Thornton,~J A.: The oxidation of oleate in submicron aqueous salt aerosols: evidence of a~surface process, J. Phys. Chem. A, 111, 1073–1083, 2007. </mixed-citation>
</ref>
<ref id="ref40">
<label>40</label><mixed-citation publication-type="other" xlink:type="simple"> McNeill,~V F., Yatavelli,~R L N., Stipe,~C B., and Landgrebe,~O.: Heterogeneous OH oxidation of palmitic acid in single component and internally mixed aerosol particles: vaporization and the role of particle phase, Atmos. Chem. Phys., 8, 5465–5476, 2008. </mixed-citation>
</ref>
<ref id="ref41">
<label>41</label><mixed-citation publication-type="other" xlink:type="simple"> Michaud, V., El Haddad, I., Liu, Y., Sellegri, K., Laj, P., Villani, P., Picard, D., Marchand, N., and Monod, A.: In-cloud processes of methacrolein under simulated conditions – Part 3: Hygroscopic and volatility properties of the formed Secondary Organic Aerosol, Atmos. Chem. Phys. Discuss., 9, 6451–6482, 2009. </mixed-citation>
</ref>
<ref id="ref42">
<label>42</label><mixed-citation publication-type="other" xlink:type="simple"> Nemet,~I., Vikic-Topic,~D., and Varga-Defterdarovic,~L.: Spectroscopic studies of methylglyoxal in water and dimethylsulfoxide, Bioorg. Chem., 32, 560–570, 2004. </mixed-citation>
</ref>
<ref id="ref43">
<label>43</label><mixed-citation publication-type="other" xlink:type="simple"> Nozière,~B., Dziedzic,~P., and Cordova,~A.: Formation of secondary light-absorbing \qutfulvic-like oligomers: a~common process in aqueous and ionic atmospheric particles?, Geophys. Res. Lett., 34, L21812, doi:10.1029/2007GL031300, 2007. </mixed-citation>
</ref>
<ref id="ref44">
<label>44</label><mixed-citation publication-type="other" xlink:type="simple"> Nozière,~B., Dziedzic,~P., and Cordova,~A.: Products and kinetics of the liquid-phase reaction of glyoxal catalyzed by ammonium ions (\chemNH_4^+), J. Phys. Chem. A, 113, 231–237, 2009. </mixed-citation>
</ref>
<ref id="ref45">
<label>45</label><mixed-citation publication-type="other" xlink:type="simple"> Nozière,~B. and Esteve,~W.: Light-absorbing aldol condensation products in acidic aerosols: Spectra, kinetics, and contribution to the absorption index, Atmos. Environ., 41, 1150–1163, 2007. </mixed-citation>
</ref>
<ref id="ref46">
<label>46</label><mixed-citation publication-type="other" xlink:type="simple"> Paulsen,~D., Dommen,~J., Kalberer,~M., Prevot,~A S H., Richter,~R., Sax,~M., Steinbacher,~M., Weingartner,~E., and Baltensperger,~U.: Secondary organic aerosol formation by irradiation of 1,3,5-trimethylbenzene-NO&lt;sub&gt;x&lt;/sub&gt;-\chemH_2O in a~new reaction chamber for atmospheric chemistry and physics, Environ. Sci. Technol., 39, 2668–2678, 2005. </mixed-citation>
</ref>
<ref id="ref47">
<label>47</label><mixed-citation publication-type="other" xlink:type="simple"> Russell,~L M., Takahama,~S., Liu,~S., Hawkins,~L N., Covert,~D S., Quinn,~P K., and Bates,~T S.: Oxygenated fraction and mass of organic aerosol from direct emission and atmospheric processing measured on the R/V Ronald Brown during TEXAQS/GoMACCS 2006, J. Geophys. Res.-Atmos., 114, D00F05, doi:10.1029/2008JD011275, 2009. </mixed-citation>
</ref>
<ref id="ref48">
<label>48</label><mixed-citation publication-type="other" xlink:type="simple"> Saathoff,~H., Naumann,~K H., Schnaiter,~M., Schock,~W., Mohler,~O., Schurath,~U., Weingartner,~E., Gysel,~M., and Baltensperger,~U.: Coating of soot and \chem(NH_4)_2SO_4 particles by ozonolysis products of alpha-pinene, J. Aerosol Sci., 34, 1297–1321, 2003. </mixed-citation>
</ref>
<ref id="ref49">
<label>49</label><mixed-citation publication-type="other" xlink:type="simple"> Schwier,~A N., Shapiro,~E L., Sareen,~N., and McNeill,~V F.: Secondary organic material formed by methylglyoxal in aqueous aerosol mimics – Part~1: Surface tension depression and light-absorbing products, Atmos. Chem. Phys. Discuss., 9, 15541–15565, 2009. </mixed-citation>
</ref>
<ref id="ref50">
<label>50</label><mixed-citation publication-type="other" xlink:type="simple"> Shapiro, E. L., Szprengiel, J., Sareen, N., Jen, C. N., Giordano, M. R., and McNeill, V. F.: Light-absorbing secondary organic material formed by glyoxal in aqueous aerosol mimics, Atmos. Chem. Phys., 9, 2289–2300, 2009. </mixed-citation>
</ref>
<ref id="ref51">
<label>51</label><mixed-citation publication-type="other" xlink:type="simple"> Smith,~D F., Kleindienst,~T E., and McIver,~C D.: Primary product distributions from the reaction of OH with $m$-, $p$-xylene, 1,2,4- and 1,3,5-trimethylbenzene, J. Atmos. Chem., 34, 339–364, 1999. </mixed-citation>
</ref>
<ref id="ref52">
<label>52</label><mixed-citation publication-type="other" xlink:type="simple"> Surratt,~J D., Gomez-Gonzalez,~Y., Chan,~A W H., Vermeylen,~R., Shahgholi,~M., Kleindienst,~T E., Edney,~E O., Offenberg,~J H., Lewandowski,~M., Jaoui,~M., Maenhaut,~W., Claeys,~M., Flagan,~R C., and Seinfeld,~J H.: Organosulfate formation in biogenic secondary organic aerosol, J. Phys. Chem. A, 112, 8345–8378, 2008. </mixed-citation>
</ref>
<ref id="ref53">
<label>53</label><mixed-citation publication-type="other" xlink:type="simple"> Tang,~I N. and Munkelwitz,~H R.: Water activities, densities, and refractive-indexes of aqueous sulfates and sodium-nitrate droplets of atmospheric importance, J. Geophys. Res.-Atmos., 99(D9), 18801–18808, 1994. </mixed-citation>
</ref>
<ref id="ref54">
<label>54</label><mixed-citation publication-type="other" xlink:type="simple"> Tuazon,~E C., Macleod,~H., Atkinson,~R., and Carter,~W P L.: Alpha-dicarbonyl yields from the NO&lt;sub&gt;x&lt;/sub&gt;-air photooxidations of a~series of aromatic-hydrocarbons in air, Environ. Sci. Technol., 20, 383–387, 1986. </mixed-citation>
</ref>
<ref id="ref55">
<label>55</label><mixed-citation publication-type="other" xlink:type="simple"> Thornberry,~T., Murphy,~D M., Thomson,~D S., de Gouw,~J A., Warneke,~C., Bates,~T S., Quinn,~P K., and Coffman,~D.: Measurement of aerosol organic compounds using a~novel collection/thermal-desorption PTR-ITMS instrument, Aerosol Sci. Technol., 43, 486–501, 2009. </mixed-citation>
</ref>
<ref id="ref56">
<label>56</label><mixed-citation publication-type="other" xlink:type="simple"> Tuazon,~E C., Macleod,~H., Atkinson,~R., and Carter,~W P L.: Alpha-dicarbonyl yields from the NO&lt;sub&gt;x&lt;/sub&gt;-air photooxidations of a~series of aromatic-hydrocarbons in air, Environ. Sci. Technol., 20, 383–387, 1986. </mixed-citation>
</ref>
<ref id="ref57">
<label>57</label><mixed-citation publication-type="other" xlink:type="simple"> Volkamer,~R., Jimenez,~J L., San Martini,~F., Dzepina,~K., Zhang,~Q., Salcedo,~D., Molina,~L T., Worsnop,~D R., and Molina,~M J.: Secondary organic aerosol formation from anthropogenic air pollution: rapid and higher than expected, Geophys. Res. Lett., 33, L17811, doi:10.1029/2006GL026899, 2006. </mixed-citation>
</ref>
<ref id="ref58">
<label>58</label><mixed-citation publication-type="other" xlink:type="simple"> Volkamer,~R., San Martini,~F., Molina,~L T., Salcedo,~D., Jimenez,~J L., and Molina,~M J.: A~missing sink for gas-phase glyoxal in Mexico City: formation of secondary organic aerosol, Geophys. Res. Lett., 34, L19807, doi:10.1029/2007GL030752, 2007. </mixed-citation>
</ref>
<ref id="ref59">
<label>59</label><mixed-citation publication-type="other" xlink:type="simple"> Volkamer, R., Ziemann, P. J., and Molina, M. J.: Secondary Organic Aerosol Formation from Acetylene (C&lt;sub&gt;2&lt;/sub&gt;H&lt;sub&gt;2&lt;/sub&gt;): seed effect on SOA yields due to organic photochemistry in the aerosol aqueous phase, Atmos. Chem. Phys., 9, 1907–1928, 2009. </mixed-citation>
</ref>
<ref id="ref60">
<label>60</label><mixed-citation publication-type="other" xlink:type="simple"> Zhao,~J., Levitt,~N P., Zhang,~R Y., and Chen,~J M.: Heterogeneous reactions of methylglyoxal in acidic media: Implications for secondary organic aerosol formation, Environ. Sci. Technol., 40, 7682–7687, 2006. </mixed-citation>
</ref>
</ref-list>
</back>
</article>