Polycyclic Aromatic Hydrocarbon Ionization Energy Lowering in Water Ices

Polycyclic Aromatic Hydrocarbon Ionization Energy Lowering in Water Ices
复制标题

水冰中多环芳烃电离能降低

DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
L. Allamandola
L. Allamandola
中科院分区：
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文献类型：
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作者：
M. Gudipati;L. Allamandola

文献摘要

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在研究各种星际和太阳系冰类似物时，我们最近发现，在真空紫外线光解作用下，低温下冻结在水冰中的多环芳烃（PAHs）很容易电离并无限期稳定为捕获离子（Gudipati; Gudipati & Allamandola）。在这里，我们报告的第一个实验研究表明，PAH电离能显着降低PAH/H2O冰，与最近的理论工作（Woon & Park）。本文研究的PAH的电离能（IE），quaterrylene（C40 H20，IE = 6.11 eV），在水冰中降低高达2.11 eV。低温水冰中PAH电离能的降低大大扩展了被捕获的离子和电子可能很重要的天文区域。这种电离能的减少也应该适用于其他类型的被困物种在富含水的星际，星周和太阳系冰。
In studying various interstellar and solar system ice analogs, we have recently found that upon vacuum ultraviolet photolysis, polycyclic aromatic hydrocarbons (PAHs) frozen in water ice at low temperatures are easily ionized and indefinitely stabilized as trapped ions (Gudipati; Gudipati & Allamandola). Here we report the first experimental study that shows that PAH ionization energy is significantly lowered in PAH/H2O ices, in agreement with recent theoretical work (Woon & Park). The ionization energy (IE) of the PAH studied here, quaterrylene (C40H20, IE = 6.11 eV), is lowered by up to 2.11 eV in water ice. PAH ionization energy reduction in low-temperature water ice substantially expands the astronomical regions in which trapped ions and electrons may be important. This reduction in ionization energy should also hold for other types of trapped species in water-rich interstellar, circumstellar, and solar system ices.