Solving the OH + Glyoxal Problem: A Complete Theoretical Description of Post-Transition-State Energy Deposition in Activated Systems

Solving the OH + Glyoxal Problem: A Complete Theoretical Description of Post-Transition-State Energy Deposition in Activated Systems
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解决 OH 乙二醛问题:活化系统中过渡态能量沉积的完整理论描述

DOI:
10.1021/acs.jpca.3c07823
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发表时间:
2024
期刊:
The Journal of Physical Chemistry A
影响因子:
--
通讯作者:
Shannon R
Shannon R
中科院分区:
--
文献类型:
--
作者:
Shannon R

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耦合反应体系中的活化化学拓宽了我们对化学动力学的理解。在气相提取反应中形成的中间体的情况下(例如,OH + HC(O)C(O)H(乙二醛)→HC(O)CO + H2O),理解反应能量如何在产物物质之间分配是特别关键的,因为这决定了给定产物经历“迅速”解离的倾向(例如,HC(O)CO → HCO + CO)。这种活化系统的一个例子是OH +乙二醛+O2偶联反应系统。在这项工作中,我们开发了一个分子动力学管道,结合主方程分析,准确地模拟以前的实验测量。这项新的工作解决了以前的复杂性和差异,从早期的主方程建模这个反应系统。这里采用的详细的分子动力学方法是一个强大的新工具,模拟具有挑战性的活化反应系统。
Activated chemistry in coupled reaction systems has broadened our understanding of the chemical kinetics. In the case of intermediates formed in gas phase abstraction reactions (e.g., OH + HC(O)C(O)H (glyoxal) →HC(O)CO + H2O), it is particularly crucial to understand how the reaction energy is partitioned between product species as this determines the propensity for a given product to undergo “prompt” dissociation (e.g., HC(O)CO → HCO + CO) before the excess reaction energy is removed. An example of such an activated system is the OH + glyoxal + O2coupled reaction system. In this work, we develop a molecular dynamics pipeline, which, combined with a master equation analysis, accurately models previous experimental measurements. This new work resolves previous complexities and discrepancies from earlier master equation modeling for this reaction system. The detailed molecular dynamics approach employed here is a powerful new tool for modeling challenging activated reaction systems.
使用盒装分子动力学在多维集体变量空间中进行自适应自由能采样。
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