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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Measuring the Kinetics of Neutral Pair Evaporation from Cluster Ions of Ionic Liquid in the Drift Region of a Differential Mobility Analyzer
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Measuring the Kinetics of Neutral Pair Evaporation from Cluster Ions of Ionic Liquid in the Drift Region of a Differential Mobility Analyzer

机译：测量差分迁移率分析仪漂移区中离子液体簇离子离子的中性对蒸发动力学

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摘要

Singly charged clusters [C+A-8],,C+ or [C A9]A- of two salts [C A9] are produced by electrospray ionization of alcohol solutions of the ionic liquids 1-ethyi-3ethYlinlidaz()IIIInl (ris(1)entailunrne(hY1)(ridunr0P110sPhate (EMI-FAP) and 1i2-difne(hY1-3propyliirlidazolitiiri-iriethide (DMPI-Me). The rate of neutral pair evaporation into [C+A + [c A-]._ic* or [c+A-],,,__IA-is studied in atmospheric pressure as a function of temperature T for the positive trimer ion (n = 2) of DMPI-Me and the negative trimer ion of EMI-FAP. The trimer is separated from all other electrosprayed ions in a first differential mobility analyzer (DMAi) and then transferred through a cooled tube to a second DMA whose drift gas is kept at a controlled temperature (25 C < T < 100 C). Singular characteristics of the DMA are a residence time r of,-0.1 to 1 ms, with essentially uniform temperature and T. The decomposition occurring within DMA2 results in a compleit 'nobility spectrum associated with dimer product ions, with apparent mobilities intermediate between those of the dimerand the trimer, depending on the product of the reaction rate k and T. A theoretical expression yielding k from the shape of the collected mobility spectrum is obtained by accounting for the deterministic reactive, convective, and dithisive evolutions of the parent and product ions within DMA2. Observed and predicted mobility spectra agree well, yielding the reaction rate k with little ambiguity. Activation energies near 1 eV are determined for both trimer ions. Paradoxically, the evaporation process substantially heats up the cluster ion product. The theory developed enables measuring decay times much smaller and much larger than the esidence time in the DMA.
机译：两种盐[C + A-8] ,, C +或[C a9] A的2个盐[C a9]是通过离子液体1-乙基-3甲基丙胺（）IIIInL（RIS（RIS）的醇溶液的电喷雾电离产生1）Entailunrne（HY1）（RIDUNR0P110sphate（EMI-FAP）和1I2-DIFNE（HY1-3PROPALIIRIDAZOLITIIRIIRIII-IRIIRIIIRIII-IRIIRIIRIIRIIRIIRI-IRIETIIRIIRIIRIIRIIRIIRIIRI-IRIITIIRIIRI-IRIETIIRIIRIIRIIRIIRIIRIIRIIR-IRIETIIRIIRIIRIIRIIRIIRIIRIIRIIRIIRIIRIIR-IRIETIIRIIRIIRIIRIIRIIRIIRIIR-IRIETHINE）。中性对蒸发速率进入[C + A + [C a - ] ._ IC *或[C + A - ] ,,,__1A-在大气压中研究了DMPI-ME和EMI-FAP的正三聚离子（n = 2）的温度T的函数。分子分离从所有其他电喷雾离子在第一差分迁移率分析仪（DMAI）中，然后通过冷却管转移到第二DMA，其漂移气体保持在受控温度（25c

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