Effect of Microhydration on the Temporary Anion States of Pyrene.
Effect of Microhydration on the Temporary Anion States of Pyrene.
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DOI：
10.1021/acs.jpclett.2c00523
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发表时间：
2022-04-28
影响因子：
5.7
通讯作者：
Verlet, Jan R. R.
中科院分区：
文献类型：
--
作者：
Lietard, Aude;Verlet, Jan R. R.
本文用二维光电子能谱研究了增量水合（≤4）对芘阴离子电子共振的影响。共振的光激发能不会改变;因此，从阴离子的角度来看，共振保持不变，但从电子-分子反应的中性角度来看，共振的能量减少了水分子的结合能。共振的自动分离表明水合作用的影响很小，表明即使是大多数共振的动力学也不受水合作用的影响。两个特定的共振确实显示了通过关闭特定的自动分离通道来解释的变化。最低能量的共振导致有效的电子捕获，如通过电子发射和水分子的蒸发（解离电子附着）所观察到的。讨论了致密分子星际云中低能电子俘获的意义。
The influence of incremental hydration (≤4) on the electronic resonances of the pyrene anion is studied using two-dimensional photoelectron spectroscopy. The photoexcitation energies of the resonances do not change; therefore, from the anion’s perspective, the resonances remain the same, but from the neutral’s perspective of the electron–molecule reaction, the resonances decrease in energy by the binding energy of the water molecules. The autodetachment of the resonances shows that hydration has very little effect, showing that even the dynamics of most of the resonances are not impacted by hydration. Two specific resonances do show changes that are explained by the closing of specific autodetachment channels. The lowest-energy resonance leads to efficient electron capture as observed through thermionic emission and evaporation of water molecules (dissociative electron attachment). The implications of low-energy electron capture in dense molecular interstellar clouds are discussed.
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