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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Soft ionization of thermally evaporated hypergolic ionic liquid aerosols
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Soft ionization of thermally evaporated hypergolic ionic liquid aerosols

机译：热蒸发的高离子离子液体气溶胶的软电离

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摘要

Isolated ion pairs of a conventional ionic liquid, 1-Ethyl-3-Methyl- Imidazolium Bis(trifluoromethylsulfonyl)imide ([Emim~+][Tf 2N~-]), and a reactive hypergolic ionic liquid, 1-Butyl-3-Methyl-Imidazolium Dicyanamide ([Bmim~+][Dca~-]), are generated by vaporizing ionic liquid submicrometer aerosol particles for the first time; the vaporized species are investigated by dissociative ionization with tunable vacuum ultraviolet (VUV) light, exhibiting clear intact cations, Emim~+ and Bmim~+, presumably originating from intact ion pairs. Mass spectra of ion pair vapor from an effusive source of the hypergolic ionic liquid show substantial reactive decomposition due to the internal energy of the molecules emanating from the source. Photoionization efficiency curves in the near threshold ionization region of isolated ion pairs of [Emim ~+][Tf_2N~-] ionic liquid vapor are compared for an aerosol source and an effusive source, revealing changes in the appearance energy due to the amount of internal energy in the ion pairs. The aerosol source has a shift to higher threshold energy (～0.3 eV), attributed to reduced internal energy of the isolated ion pairs. The method of ionic liquid submicrometer aerosol particle vaporization, for reactive ionic liquids such as hypergolic species, is a convenient, thermally "cooler" source of isolated intact ion pairs in the gas phase compared to effusive sources.
机译：常规离子液体1-乙基-3-甲基-咪唑双（三氟甲基磺酰基）酰亚胺（[Emim〜+] [Tf 2N〜-]）和反应性高离子性离子液体1-Butyl-3-的分离离子对甲基咪唑鎓双氰胺（[Bmim〜+] [Dca〜-]）是通过第一次蒸发离子液体亚微米级气溶胶颗粒而产生的;通过使用可调真空紫外线（VUV）进行离解电离来研究汽化的物质，这些光表现出清晰的完整阳离子Emim〜+和Bmim〜+，大概源自完整离子对。来自高离子性离子液体的流出源的离子对蒸气的质谱显示出显着的反应性分解，这是由于源于该源的分子的内部能量所致。比较了气溶胶源和喷射源中[Emim〜+] [Tf_2N〜-]离子液体蒸气的离析离子对的接近阈值电离区域的光电离效率曲线，揭示了由于内部量而引起的外观能的变化。离子对中的能量。气溶胶源具有更高的阈值能量（〜0.3 eV），这归因于隔离离子对的内部能量降低。与反应性离子源相比，用于反应性离子液体（例如高果酸类）的离子液体亚微米气雾剂颗粒汽化方法是气相中分离的完整离子对的便捷，热“冷”源。

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