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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Possible Formation and Destruction of the OD+ Ions in the Interstellar Medium
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Possible Formation and Destruction of the OD+ Ions in the Interstellar Medium

机译：在星际介质中可能的形成和破坏OD +离子

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摘要

The OH+ ion is an important constituent of the interstellar medium (ISM). It can be used as a probe of cosmic ray and X-ray ionization rates in molecular clouds as well as a tracer of oxygen chemistry. The deuterated variant of OH+, the OD+ ion, may also be present in the ISM despite the fact that it has not been detected yet. In this paper, we aim at providing quantitative insight into the OD+ chemistry and at accurately studying the possible formation and destruction processes of OD+ in the ISM. We study the formation and destruction of OD+ through the O+ + HD -> OD+ + H and OH+ + D <-> OD+ + H reactions that can occur in diffuse ISM. Reactive rate constants have been obtained from exact state-to-state quantum wave packet calculations for temperatures ranging from 10 to 1000 K. The new theoretical data are validated through a detailed comparison with available experimental data. The formation of OD+ is found to be less efficient than that of OH+. As a first application, the OD+/OH+ abundance ratio in ISM has been evaluated from a simple astrochemical model, and we found that this ratio can be larger than D/H abundance ratio only at low temperatures. These calculations may help in an astrochemical search of OD+ in cold ISM.
机译：OH +离子是星际培养基（ISM）的重要组成部分。它可以用作分子云中的宇宙射线和X射线电离速率的探针以及氧气化学的示踪剂。尽管尚未检测到它尚未检测到，但OH +的OH +的氘代变型也可以存在于ISM中。在本文中，我们旨在提供对OD +化学的定量洞察，并准确地研究ISM中OD +的可能形成和破坏过程。我们研究了OD +通过O ++ HD - OD + + H和OH + + D < - > OD + + H反应的形成和破坏，可以在漫反射ISM中发生。已经从精确的状态到常数波分组计算获得了反应速率常数，用于从10到1000 K的温度。通过与可用实验数据的详细比较进行验证，验证新的理论数据。发现OD +的形成比OH +的效率低。作为第一应用，ISM中的OD + / OH +丰度比已经从简单的星形化学模型评估，我们发现该比率可以在低温下大于D / H丰度。这些计算可能有助于在冷ISM中的OD +的星式搜索中。

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