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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>8</volume_number>
		<issue_number>6</issue_number>
		<publication_year>2008</publication_year>
	</journal>
	<doi>10.5194/acpd-8-20799-2008</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/8/20799/2008/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/8/20799/2008/acpd-8-20799-2008.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/8/20799/2008/acpd-8-20799-2008.pdf</fulltext_pdf>
	<start_page>20799</start_page>
	<end_page>20838</end_page>
	<publication_date>2008-12-12</publication_date>
	<article_title content_type="html">Glyoxal uptake on ammonium sulphate seed aerosol: reaction products and reversibility of uptake under dark and irradiated conditions</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>M. M. Galloway</name>
		</author>
		<author numeration="2" affiliations="2">
			<name>P. S. Chhabra</name>
		</author>
		<author numeration="3" affiliations="2">
			<name>A. W. H. Chan</name>
		</author>
		<author numeration="4" affiliations="3">
			<name>J. D. Surratt</name>
		</author>
		<author numeration="5" affiliations="2,4">
			<name>R. C. Flagan</name>
		</author>
		<author numeration="6" affiliations="2,4">
			<name>J. H. Seinfeld</name>
		</author>
		<author numeration="7" affiliations="1">
			<name>F. N. Keutsch</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Dept. of Chemistry, University of Wisconsin-Madison, Madison, WI, USA</affiliation>
		<affiliation numeration="2" content_type="html">Dept. of Chemical Engineering, California Institute of Technology, Pasadena, CA, USA</affiliation>
		<affiliation numeration="3" content_type="html">Dept. of Chemistry, California Institute of Technology, Pasadena, CA, USA</affiliation>
		<affiliation numeration="4" content_type="html">Dept. of Environmental Science and Engineering California Institute of Technology, Pasadena, CA, USA</affiliation>
	</affiliations>
	<abstract content_type="html">Chamber studies of glyoxal uptake onto neutral ammonium sulphate aerosol were
performed under dark and irradiated conditions to gain further insight into
processes controlling glyoxal uptake onto ambient aerosol. Organic fragments
from glyoxal dimers and trimers were observed within the aerosol under dark
and irradiated conditions; glyoxal oligomer formation and overall organic
growth were found to be reversible under dark conditions. Analysis of
high-resolution time-of-flight aerosol mass spectra provides evidence for
irreversible formation of carbon-nitrogen (C-N) compounds in the aerosol.
These compounds are likely to be imidazoles formed by reaction of glyoxal
with the ammonium sulphate seed. To the authors&apos; knowledge, this is the first
time C-N compounds resulting from condensed phase reactions with ammonium
sulphate seed have been detected in aerosol. Organosulphates were not
detected under dark conditions. However, active oxidative photochemistry,
similar to that found in cloud processing, was found to occur within aerosol
during irradiated experiments. Organosulphates, carboxylic acids, and organic
esters were identified within the aerosol. Our study suggests that both C-N
compound formation and photochemical processes should be considered in models
of secondary organic aerosol formation via glyoxal.</abstract>
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