Ion–Molecule Chemistry Relevant to Iodine in the Upper Atmosphere

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ACS Earth and Space Chemistry Pub Date : 2026-09-17 Epub Date: 2026-09-01 DOI:10.1021/acsearthspacechem.6c00175

Tucker W. R. Lewis, Shaun G. Ard, Albert A. Viggiano, Nicholas S. Shuman, Wuhu Feng, John M. C. Plane

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引用次数: 0

Abstract

The kinetics of I⁺ + O₃, IO⁺ + O₃, and IO⁺ + O are measured using a selected-ion flow tube apparatus over the range of 160–300 K. Recommended rate constants (cm³ s^–1) are: I⁺ + O3 k = 8.9 ± 1 × 10^–10 (T/200 K)^−0.15; IO⁺ + O₃k = 8 ± 2 × 10^–11; IO⁺ + O k = 1.6 ± 0.5 × 10^–10 (T/200 K)⁻² cm³ s^–1. The IO⁺ + O₃ reaction yields primarily IO₂⁺ + O₂, with an upper limit on I⁺ + 2O₂ of 10^–11 cm³ s^–1. The results are supported by density functional calculations. A previously reported implementation of iodine chemistry using the Whole Atmosphere Community Climate Model is updated with these values and the chemistry of iodine in the upper atmosphere is discussed.

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高层大气中与碘有关的离子分子化学

i++ O3， i++ O3和i++ o0的动力学是使用一个选择的离子流管装置在160-300 K的范围内测量的。推荐常数（cm3 s-1）为：I+ + o3k = 8.9±1 × 10-10 (T/ 200k)−0.15；IO+ + O3k = 8±2 × 10-11；IO+ + O k = 1.6±0.5 × 10-10 (T/ 200k)−2 cm3 s-1。IO+ + O3反应主要生成IO2+ + O2， IO2+ + O2的上限为10-11 cm3 s-1。结果得到了密度泛函计算的支持。用这些值更新了先前报道的利用全大气群落气候模型实现的碘化学，并讨论了高层大气中碘的化学。

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来源期刊

ACS Earth and Space Chemistry Earth and Planetary Sciences-Geochemistry and Petrology

CiteScore

5.30

自引率

11.80%

发文量

249

期刊介绍： The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.