Negative Ions

在这个由化学系实验物理化学计划资助的项目中，田纳西大学的Robert Compton教授将继续并扩大他对负离子的研究。偶极和四极束缚阴离子的研究将集中在这些弱束缚阴离子在阈值附近的困难的能量区域（毫电子伏）的光剥离。光剥离阈值的测量将提供这些阴离子的准确的电子亲和力，这可以与通过里德伯电子转移和电场剥离方法获得的不太准确的值进行比较。将在荷兰自由电子设施进行共振增强多光子解离实验，研究多电荷阴离子的振动光谱。丹麦奥胡斯的ELISA离子储存环正在进行多电荷阴离子的碰撞解离研究。 另一个目标是记录手性负离子如酒石酸阴离子和二价阴离子的第一个光剥离圆二色性截面。 所有这些研究将有一个强大的理论组成部分，这项研究将与研究生和本科生的协助下进行，以及与美国内外的合作者。通过参与这项研究以及与其他美国和国际团体的合作，学生将获得宝贵的经验，为他们在学术，政府或工业经济部门的深造或就业做好准备。

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Prof. Robert Compton of the University of Tennessee will continue and expand his research on negative ions. Studies of dipole and quadrupole bound anions will focus on photodetachment of these weakly bound anions in the difficult energy region near threshold (millielectron volts). Measurements of the photodetachment threshold will provide accurate electron affinities of these anions which can be compared to less accurate values obtained by Rydberg electron transfer and electric field detachment methods. Resonantly-enhanced multiphoton dissociation experiments will be conducted at the Netherlands free electron facility (FELIX) on vibrational spectroscopy of multiply charged anions. Collisional dissociation studies of multiply-charged anions are being carried out at the ELISA ion storage ring in Aarhus, Denmark. Another goal is to record the first photodetachment circular dichroism cross section for a chiral negative ion such as the tartaric acid anion and dianion. All of these studies will have a strong theoretical component This research will be conducted with the assistance of graduate and undergraduate students, as well as with collaborators within and outside the United States. Through their participation in this research and the collaborations with other American and international groups the students will gain valuable experience that will prepare them for advanced studies or employment in the academic, government or industrial sectors of the economy.