The Experimental Rate Constant of the S +(2 D) + H 2 Reaction.

IF 2.9 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
ACS Earth and Space Chemistry Pub Date : 2025-02-17 eCollection Date: 2025-03-20 DOI:10.1021/acsearthspacechem.4c00391
Alexandre Zanchet, Jia Lei Chen-Qiu, Pascal Larregaray, Laurent Bonnet, Claire Romanzin, Nicolas Solem, Roland Thissen, Christian Alcaraz
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引用次数: 0

Abstract

Endothermic reactions such as S +(4 S) + H 2 are not expected to play a significant role in the chemistry of the interstellar medium (ISM). However, in some specific environments, such as photon-dominated regions (PDR), UV radiation may catalyze the reaction by providing enough internal energy to reactants to overcome endothermicity. For instance, it was recently shown that the vibrational excitation of H2 greatly enhances the reactivity of C+ and S+ with H2, explaining the presence of their respective hydrides CH+ and SH+ in these regions. However, vibrational excitation of H2 is not a unique way to enhance the reactivity by UV radiation. Electronic excitation is an alternative way to effectively inject a huge amount of internal energy into the system, thus favoring reactivity. In this work, we will address how electronic excitation of the sulfur cation can strongly enhance the production of SH+. This is done by measuring experimentally the cross section of the title reaction for collision energies from 50 meV up to several eV and comparing the results with theoretical predictions in the 0.001-3 eV range. The reaction cross section is then used to derive the rate constant for a wide range of temperatures.

S +(2d) + h2反应的实验速率常数。
像S +(4s) + h2这样的吸热反应预计不会在星际介质(ISM)的化学中起重要作用。然而,在某些特定的环境中,如光子主导区(PDR),紫外线辐射可以通过为反应物提供足够的内能来催化反应,从而克服吸热性。例如,最近的研究表明,H2的振动激发极大地增强了C+和S+与H2的反应活性,这解释了它们各自的氢化物CH+和SH+在这些区域的存在。然而,氢的振动激发并不是增强紫外辐射反应性的唯一途径。电子激发是另一种有效地向系统注入大量内能的方法,从而有利于反应性。在这项工作中,我们将讨论硫离子的电子激发如何能强烈地促进SH+的产生。这是通过实验测量碰撞能量从50 meV到几个eV的标题反应的横截面,并将结果与理论预测的0.001-3 eV范围进行比较来完成的。然后用反应截面推导出在很宽温度范围内的速率常数。
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来源期刊
ACS Earth and Space Chemistry
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.
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