Flowing Afterglow and SIFT-Drift Studies of Gas Phase Ion-Molecule Reactions

这个项目，在有机动力学计划，涉及 C的继续工作。De Puy和V. Bierbaum 在科罗拉多。 它们会产生高活性的离子物质 通过高真空下的电子碰撞，并观察到， 光谱分析，这些物质碰撞产生的反应 离子与中性分子。 这将导致更好的 理解有机离子反应， 存在于凝聚相中的溶剂化效应 反应. 离子和中性分子在流动中的反应 将研究余辉选择离子流管装置。 离子将通过电子碰撞或其他方法产生 包括与其它离子分离的离子合成反应 和中性前体在四极滤质器中， 和0.5毫升的氦气一起注入流管。 高度 将允许反应性离子，例如CH阴离子， 与各种中性试剂反应，以比较 它们的反应速率和产物通道， 常规反应物离子。 同位素标记离子， 特别是含有S-34、Cl-37、O-18和C-13的那些， 用作示踪剂，以检查反应的速率， 否则将被隐藏，例如，HS-34之间 阴离子和硫化氢（S-32）。正电荷 烃阳离子，预计将出现在 星际介质将被允许与分子反应 (e.g.,水）已知存在于太空中， 了解有机分子的起源下不寻常的 空间的条件。 极弱酸性的酸度 分子，例如胺、杂芳族化合物和 烷烃，将通过硅烷的化学反应来探测。 的 总体目标是了解简单有机的细节 通过消除溶剂化的模糊效应进行离子反应。

This project, within the Organic Dynamics Program, involves the continuing work of C. De Puy and V. Bierbaum of the University of Colorado. They will generate highly reactive, ionic species by electron impact under high vacuum, and observe, by mass spectrometry, reactions resulting from the collision of these ions with neutral molecules. This will lead to a better understanding of organic ionic reactions by removing the effects of solvation which are present in condensed phase reactions. Reactions between ions and neutral molecules in a flowing afterglow selected ion flow tube apparatus will be studied. Ions will be generated by electron impact or by other methods including ion synthesis reactions, separated from other ions and neutral precursors in a quadrupole mass filter and injected into a flow tube together with 0.5 torr of helium. Highly reactive ions, as for example CH anion, will be allowed to react with a variety of neutral reagents in order to compare their reaction rates and product channels with more conventional reactant ions. Isotopically labeled ions, particularly those containing S-34, Cl-37, O-18 and C-13, will be used as tracers to examine rates for reactions which would otherwise be hidden as in, for example, that between HS-34 anion and hydrogen sulfide (S-32). Positively charged hydrocarbon cations which are expected to occur in the interstellar medium will be allowed to react with molecules (e.g., water) known to be present in space in an attempt to understand the origin of organic molecules under the unusual conditions of space. The acidity of very weakly acidic molecules, for example amines, heteroaromatic compounds and alkanes, will be probed by chemical reactions of silanes. The overall goal is to understand the details of simple organic ionic reactions by removing the obscuring effects of solvation.