Michalski Greg, Bhattacharya S K
Department of Earth and Atmospheric Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, USA.
Proc Natl Acad Sci U S A. 2009 Apr 7;106(14):5493-6. doi: 10.1073/pnas.0812755106. Epub 2009 Mar 23.
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(2)(-) + O(3), for assessing the internal distribution of the Delta(17)O anomaly and the delta(18)O enrichment in ozone produced by electric discharge. The Delta(17)O results strongly support the symmetry mechanism for generating mass independent fractionations, and the delta(18)O results are consistent with published data. Positional Delta(17)O and delta(18)O 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.
了解“异常”同位素富集的内部分布，对于验证关于这些富集在诸如臭氧等分子中的起源的理论假设，以及理解这些富集通过质量转移向大气中其他化合物的转移具有重要意义。在此，我们提出一种利用反应NO(2)(-) + O(3)来评估放电产生的臭氧中Δ(17)O异常和δ(18)O富集的内部分布的方法。Δ(17)O结果有力地支持了产生质量独立分馏的对称机制，并且δ(18)O结果与已发表的数据一致。臭氧中位置性的Δ(17)O和δ(18)O富集现在可以更有效地用于光化学模型，这些模型利用质量平衡氧原子转移机制来推断大气氧化化学。
