RUI: Structure and Spectroscopy of Negative Ions

该RUI实验研究计划旨在通过两个系列的实验研究光子与负离子的相互作用。电子相关效应主要将额外的电子结合在负离子中，因此负离子为关于这些多体相互作用的最先进的原子物理学计算提供了肥沃的试验场。交叉千伏离子束/可调谐激光系统将首次用于测量镧系负离子基态阈值附近的高精度光剥离截面。第二系列补充实验将在劳伦斯伯克利国家实验室的先进光源（ALS）中使用高能光子研究硒，锂和碳负离子的内壳光剥离。这些实验继续了PI的一系列研究，以研究外层电子对分离的内电子波函数的影响。该方案的更广泛影响侧重于通过RUI机制对本科生进行教育。

This RUI experimental research program is aimed at a study of the interactions of photons with negative ions in two series of experiments. Electron correlation effects bind the extra electron in a negative ion predominantly and therefore negative ions provide a fertile testing ground for state of-the-art atomic physics calculations regarding these multi-body interactions. A crossed kilovolt ion beam/tunable laser system will be used to measure high precision photodetachment cross sections near the ground state thresholds of lanthanide negative ions for the first time. The second series of complementary experiments will investigate inner-shell photodetachment from selenium, lithium, and carbon negative ions using high-energy photons at the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory. These experiments continue a series of studies by the PIs to investigate the effects of the outer-shell electrons on the detaching inner electron's wavefunction. The broader impact of the program focuses on the eduation of undergraduate students through the RUI mechanism.