Carbonyl oxides, R1R2COO, alternatively known as Criegee intermediates (CIs), are short-lived molecules produced from ozonolysis of alkenes. These ozonolysis reactions yield highly excited CIs, and most of them promptly decay with emission of the OH radical and other products. Some of the nascent CIs are stabilised by collisional relaxation with surrounding molecules, and react with atmospheric trace constituents, such as SO2 and gaseous organic compounds, converting them to more highly oxygenated molecules relevant to formation of aerosols. Hence, reactions of CIs are of central interest for atmospheric chemists. Physico-chemical properties of CIs are strongly related to their geometrical and electronic structures, which are often discussed based on spectroscopic information. Especially, very high resolution rotational spectroscopy provides critical information about molecular structures and intramolecular dynamics, and also enables us to probe individual isomers, conformers, and isotopologues, with complete selectivity. This article reviews the rotational investigations carried out on several CIs, their bimolecular complexes and primary reaction products, focusing on their molecular structure, conformational behaviour and reactivity.

中文翻译：

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Criegee 中间体满足旋转光谱

羰基氧化物 R1R2COO，也称为 Criegee 中间体 (CI)，是由烯烃臭氧分解产生的短寿命分子。这些臭氧分解反应产生高度激发的 CI，其中大部分会随着 OH 自由基和其他产物的发射而迅速衰减。一些新生的 CI 通过与周围分子的碰撞弛豫而稳定，并与大气中的痕量成分（如 SO2 和气态有机化合物）发生反应，将它们转化为与气溶胶形成相关的含氧量更高的分子。因此，CI 的反应是大气化学家的核心兴趣所在。CI 的物理化学性质与其几何和电子结构密切相关，这通常基于光谱信息进行讨论。尤其，非常高分辨率的旋转光谱提供了关于分子结构和分子内动力学的关键信息，还使我们能够以完全的选择性探测单个异构体、构象异构体和同位素体。本文回顾了对几种 CI、它们的双分子复合物和初级反应产物进行的旋转研究，重点关注它们的分子结构、构象行为和反应性。