Gas Phase Ion Chemistry and Thermochemistry

实验物理化学计划支持教授维罗妮卡 科罗拉多大学博尔德分校的Bierbaum在她的继续研究中 气相离子-分子反应的动力学、机理和热化学 反应. Bierbaum博士将在以下领域开展研究： 1)氯甲烷对称SN 2反应函数研究 压力，缓冲气体和同位素替代，以及SN 2反应性 气相中的中性氮;以及2）实验和计算 离子热化学研究与大气相关系统。 在 此外，她将继续两个新项目：3）反应的研究， 含氮和氧原子的离子;和4）化学电离检测 生物排放物。 PI将采用串联流动 三重四极耦合余辉选择离子流漂移管 检测器进行反应并监测产物。 这项研究计划的实验结果将有助于 我们对反应动力学、机理和 热化学，以及提供有价值的比较与理论。 许多热化学数据与重要的燃烧有关， 大气过程。 生物源排放的特征 解决了大气化学中的一个关键问题： 地球对流层中高浓度的含氧烃 目前尚不清楚;然而，它们对大气层的影响 化学是重要的。

The Experimental Physical Chemistry Program supports Prof. Veronica Bierbaum of the University of Colorado-Boulder in her continuing studies of the kinetics, mechanisms and thermochemistry of gas phase ion-molecule reactions. Dr. Bierbaum will carry out research in the following areas: 1) the study of symmetric SN2 reactions of methyl chloride as a function of pressure, buffer gas and isotope substitution, and SN2 reactivity at neutral nitrogen in the gas phase; and 2) experimental and computational studies of ion thermochemistry to systems of atmospheric relevance. In addition, she will pursue two new projects: 3) the study of reactions of ions with nitrogen and oxygen atoms; and 4) chemical ionization detection of biogenic emissions. The PI will employ a tandem flowing afterglow-selected ion flow-drift tube coupled with a triple quadrupole detector to carry out the reactions and monitor products. The experimental results from this research program will contribute to our fundamental understanding of reaction kinetics, mechanism, and thermochemistry, as well as provide valuable comparison with theory. Much of the thermochemical data has relevance to important combustion and atmospheric processes. The characterization of biogenic emissions addresses a critical problem in atmospheric chemistry: the sources of high concentrations of oxygenated hydrocarbons in the earth's troposphere are not currently understood; however, their impact on atmospheric chemistry is significant.