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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Kinetic Studies of Negative Ion Reactions in a Quadrupole Ion Trap: Absolute Rate Coefficients and Ion Energies
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Kinetic Studies of Negative Ion Reactions in a Quadrupole Ion Trap: Absolute Rate Coefficients and Ion Energies

机译：四极离子阱中负离子反应的动力学研究：绝对速率系数和离子能量

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摘要

A new apparatus consisting of an ion-molecule reactor coupled to a quadrupole ion trap is described. The kinetics and products of the rapid reactions of SF_6~- with SO_2, HNO_3, and HCl in the ion trap are reported. There is excellent agreement between the ion trap rate coefficients and yields, and flowing afterglow results. Rate coefficients for reactions of products of the SF_6~- reactions are also reported. Measurements of the equilibrium constant for the reaction NO_3~-·HNO_3 + HNO_3 <->NO_3~-·(HNO_3)_2 in the ion trap provide a very sensitive measure of the energy of the trapped ions. These measurements indicate that the effective temperature of the trapped NO_3~-·(HNO_3)_2 ion is 320 ± 30 K for an ion trap at 298 K (1-2 mTorr He, q_z = 0.074). The presence of 0.2 mTorr N_2 buffer gas increases the internal temperature of the trapped ions by about 10 K. The internal temperature is also a weak function of the trapping potential, increasing by about 10 K over the range 0.074 < q_z < 0.286.
机译：描述了一种由与四极离子阱耦合的离子分子反应器组成的新设备。报道了SF_6〜-与SO_2，HNO_3和HCl在离子阱中快速反应的动力学和产物。离子阱速率系数与产率和流动的余辉结果之间有着极好的一致性。还报道了SF_6〜-反应产物的反应速率系数。离子阱中反应NO_3〜-·HNO_3 + HNO_3 <-> NO_3〜··（HNO_3）_2的平衡常数的测量提供了对被捕获离子能量的非常敏感的度量。这些测量表明，对于在298 K（1-2 mTorr He，q_z = 0.074）的离子阱，被捕获的NO_3〜-·（HNO_3）_2离子的有效温度为320±30K。 0.2 mTorr N_2缓冲气体的存在会使捕获的离子的内部温度增加大约10K。内部温度还是捕获势的弱函数，在0.074

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