The Structure and Dissociation Dynamics of Energy Selected Ions and Ion-Dipole Complexes

这笔实验物理化学拨款支持托马斯·贝尔博士在离子碎裂机制领域的研究。本工作研究了能量选择离子和离子-偶极络合物的结构和解离动力学。它提供了有关离子性质和能量状态的基本信息。这种信息在从高层大气物理到固态化学的广泛领域都是必要的。本研究将利用光电子-光离子符合、光解离和红外光解离技术研究冷离子如硝基苯、丙醇、丁二烯和离子-偶极络合物，如环丙烷离子-水和乙氯离子-盐酸。我们将比较中性离解和离子离解的不同之处，如它们的机制、离解速率以及激发态在碎裂步骤中的作用。离子结构的巨大变化将作为其内部能量的函数进行研究。将特别强调避免分离碎片之间的相互作用势对解离速率和解离机制的影响。

This grant in Experimental Physical Chemistry supports the research of Dr. Tomas Baer in the area of ion fragmentation mechanisms. This work studies the structure and dissociation dynamics of energy selected ions and ion-dipole complexes. It provides basic information on the properties and energy states of ions. Such information is necessary in a broad range of fields from upper atmosphere physics to solid state chemistry. This investigation will use photoelectron photoion coincidence, photodissociation, and IR photodissociation techniques to study cold ions such as nitrobenzene, propanol, and butadiene and ion-dipole complexes such as cyclopropane ion-water and ethylchloride ion-HCl. Differences between neutral and ionic dissociations, as revealed in terms of their mechanisms, rates of dissociation, and the role of excited states in the fragmentation step will be compared. Gross changes in the structures of the ions will be studied as a function of their internal energy. Special emphasis will be given to eludicating the effect the interaction potential between the departing fragments has on the dissociation rate and mechanism.