期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2009
卷号：106
期号：14
页码：5493-5496
DOI：10.1073/pnas.0812755106
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Understanding the internal distribution of "anomalous" isotope enrichments has important implications for validating theoretical postulates on the origin of these enrichments in molecules such as ozone and for understanding the transfer of these enrichments to other compounds in the atmosphere via mass transfer. Here, we present an approach, using the reaction NO[IMG]f1.gif" ALT="Formula" BORDER="0"> + O3, for assessing the internal distribution of the {Delta}17O anomaly and the {delta}18O enrichment in ozone produced by electric discharge. The {Delta}17O results strongly support the symmetry mechanism for generating mass independent fractionations, and the {delta}18O results are consistent with published data. Positional {Delta}17O and {delta}18O enrichments in ozone can now be more effectively used in photochemical models that use mass balance oxygen atom transfer mechanisms to infer atmospheric oxidation chemistry.
