| Photodissociation cross section of ClOOCl at 330 nm. | |
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MedLine Citation:
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PMID: 20085296 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The photolysis rate of ClOOCl is crucial in the catalytic destruction of polar stratospheric ozone. In this work, we determined the photodissociation cross section of ClOOCl at 330 nm with a molecular beam and with mass-resolved detection. The photodissociation cross section is the product of the absorption cross section and the dissociation quantum yield. We formed an effusive molecular beam of ClOOCl at a nozzle temperature of 200 or 250 K and determined its photodissociation probability by measuring the decrease of the ClOOCl intensity upon laser irradiation. By comparing with a reference molecule (Cl(2)), of which the absorption cross section and dissociation quantum yield are well-known, we determined the absolute photodissociation cross section of ClOOCl at 330 nm to be (2.31 +/- 0.11) x 10(-19) cm(2) at 200 K and (2.47 +/- 0.12) x 10(-19) cm(2) at 250 K. Impurity interference has been a well-recognized problem in conventional spectroscopic studies of ClOOCl; our mass-resolved measurement directly overcomes such a problem. This measurement of the ClOOCl photolysis cross section at 330 nm is particularly useful in constraining its atmospheric photolysis rate, which in the polar stratosphere peaks near this wavelength. |
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Authors:
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Bing Jin; I-Cheng Chen; Wen-Tsung Huang; Chien-Yu Lien; Nikhil Guchhait; Jim J Lin |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The journal of physical chemistry. A Volume: 114 ISSN: 1520-5215 ISO Abbreviation: J Phys Chem A Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-04-08 Completed Date: 2010-07-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9890903 Medline TA: J Phys Chem A Country: United States |
Other Details:
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Languages: eng Pagination: 4791-7 Citation Subset: - |
Affiliation:
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Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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