NDLI: Nitrate ion photochemistry at interfaces: a new mechanism for oxidation of α-pinene

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yu, Yong Ezell, Michael J. Zelenyuk, Alla Imre, Dan Alexander, Liz Ortega, John Thomas, Jennie L. Gogna, Karun Tobias, Douglas J. D'Anna, Barbara Harmon, Chris W. Johnson, Stanley N. Finlayson-Pitts, Barbara J.
Description	Country affiliation: United States Author Affiliation: Yu Y ( Department of Chemistry, University of California Irvine, Irvine, CA 92697-2025, USA.)
Abstract	The photooxidation of 0.6–0.9 ppm α-pinene in the presence of a deliquesced thin film of $NaNO_{3},$ and for comparison increasing concentrations of $NO_{2},$ was studied in a 100 L Teflon® chamber at relative humidities from 72–88% and temperatures from 296–304 K. The loss of α-pinene and the formation of gaseous products were followed with time using proton transfer mass spectrometry . The yields of gas phase products were smaller in the $NaNO_{3}$ experiments than in $NO_{2}$ experiments. In addition, pinonic acid , pinic acid , trans-sobrerol and other unidentified products were detected in the extracts of the wall washings only for the $NaNO_{3}$ photolysis. These data indicate enhanced loss of α-pinene at the $NaNO_{3}$ thin film during photolysis. Supporting the experimental results are molecular dynamics simulations which predict that α-pinene has an affinity for the surface of the deliquesced nitrate thin film, enhancing the opportunity for oxidation of the impinging organic gas during the nitrate photolysis. This new mechanism of oxidation of organics may be partially responsible for the correlation between nitrate and the organic component of particles observed in many field studies, and may also contribute to the missing source of SOA needed to reconcile model predictions and field measurements. In addition, photolysis of nitrate on surfaces in the boundary layer may lead to oxidation of co-adsorbed organics.
File Format	HTM / HTML
ISSN	14639076
Issue Number	21
Volume Number	10
e-ISSN	14639084
Journal	Physical Chemistry Chemical Physics
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-06-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Physics Discipline Biophysics Discipline Chemistry Monoterpenes Chemistry Nitrates Computer Simulation Ions Models, Molecular Molecular Structure Oxidation-reduction Photochemistry Journal Article Research Support, U.s. Gov't, Non-p.h.s.
Alternative Title	Nitrate ion photochemistry at interfaces: a new mechanism for oxidation of alpha-pinene
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in