Real-Time Studies of Negative Ion Photodissociation and Reaction Dynamics

在这个项目中的物理化学程序的化学 司，D.加州大学伯克利分校的纽马克说， 将研究负离子的光解和反应动力学 在真实的时间里。负离子AB-被激发成离解电子， 通过飞秒激光脉冲来实现。第二飞秒激光脉冲， 相对于第一个延迟的时间，导致 解离离子，并记录所得的光电子谱。 这个过程允许观察最初的衰变。 激发物种，测定的出现时间的各种 阴离子产物及其内能的测量 分布 多原子阴离子O3-、CO3-和I3-将被 研究了 还将研究涉及这些簇阴离子 单体阴离子单元。 虽然负离子在大气和溶液中起着重要的作用， 相化学，光解离和反应的细节 动力学知之甚少。 这项研究的目的是获得一个 通过使用最先进的技术， 超快激光技术来跟踪的时间演变的 负离子的离解或反应。

In this project in the Physical Chemistry program of the Chemistry Division, Prof. D. Neumark of the University of California at Berkeley will study the photodissociation and reaction dynamics of negative ions in real time. A negative ion AB- is excited to a dissociative electronic state by a femtosecond laser pulse. A second femtosecond laser pulse, time delayed with respect to the first, causes photodetachment of the dissociating ion and the resulting photoelectron spectrum is recorded. This procedure the permits observation of the decay of the initially excited species, the determination of the appearance times of the various anion products, and the measurement of their internal energy distribution. The polyatomic anions O3-, CO3- and I3- will be investigated. Also studied will be cluster anions involving these monomer anion units. Although negative ions play important roleq in atmospheric and solution phase chemistry, the details of the photodissociation and reaction dynamics are poorly understood. The goal of this research is to obtain a better understanding of these processes by using state-of-the-art ultrafast laser techniques to track the time evolution of the dissociation or reaction of a negative ion.