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Main Title Reactivity of polynuclear aromatic hydrocarbons with O2 and NO in the presence of light /
Author Geacintov, Nicholas E.
Other Authors
Author Title of a Work
Coffin, D. L.
CORP Author New York Univ., N.Y. Dept. of Chemistry.;National Environmental Research Center, Research Triangle Park, N.C.
Publisher Office of Research and Development, U.S. Environmental Protection Agency ; Available from National Technical Information Service,
Year Published 1973
Report Number EPA/650-1-74-010; EPA-R-801393
Stock Number PB-238294
OCLC Number 37663845
Subjects Polycyclic aromatic hydrocarbons--Research ; Air--Pollution--Research
Additional Subjects Aromatic polycyclic hydrocarbons ; Nitrogen oxide(NO) ; Oxygen ; Chemical reactivity ; Adsorption ; Excitation ; Photochemical reactions ; Molecular energy levels ; Air pollution ; Deuterium compounds ; Quenching(Inhibition) ; Electronic states ; Surface chemistry ; Atmospheric chemistry
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 650-1-74-010 Headquarters Library/Washington,DC 09/09/2013
EJBD  EPA 650-1-74-010 c.1 Headquarters Library/Washington,DC 05/27/2014
EKBD  EPA-650/1-74-010 Research Triangle Park Library/RTP, NC 08/19/2016
ELBD RPS EPA 650-1-74-010 repository copy AWBERC Library/Cincinnati,OH 08/01/2017
NTIS  PB-238 294 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation iv, 31 pages : illustrations ; 28 cm.
The reactivity of 20 different aromatic hydrocarbons adsorbed on solid polystyrene fluffs with oxygen and nitric oxide in the presence of light has been studied. The reaction conditions simulated those encountered in polluted atmospheres. Among the compounds studied were anthracene, pyrene, naphthalene, chrysene, benz(a)anthracene and coronene. The photoexcited triplet and singlet states of the aromatic hydrocarbons react predominantly via the quenching of the fluorescence and phosphorescence by the paramagnetic O2 and NO gases. The probability of quenching per collisional encounter and the formation of singlet oxygen depends on spin selection rules, the triplet energy, and the electron density (in the case of the monomethyl derivatives of benz(a)anthracene). NO quenching of the triplets appears to be a charge-transfer process for molecules with a high triplet energy. The most important contribution of the photoexcited aromatic hydrocarbons (per photon absorbed) to the photochemistry of atmospheres containing O2 and NO appears to be the generation of singlet oxygen, since photochemical degradation of the compounds studied was negligible compared to quenching.
Performed by Chemistry Department, New York University. Sponsored by Human Studies Laboratory, National Environmental Research Center. Prepared for Office of Research and Development, U.S. Environmental Protection Agency. "December 1973." "EPA/650-1-74-010." EPA Project Officer: David L. Coffin. Includes bibliographical references.