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RUI: Structure and Dynamics of Negative Ions

RUI：负离子的结构和动力学

基本信息

批准号：
1707743
负责人：
Nevin Gibson
金额：
$ 34.4万
依托单位：
Denison University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2021-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1707743&HistoricalAwards=false
关键词：
RUI Structure Dynamics Negative Ions

项目摘要

Negative ions are important in a variety of physical processes including Earth's atmosphere, stellar atmospheres and electrical discharges and plasmas. The broader impacts of this research program include contributions to the database of atomic properties, connections to other scientific fields, and the education and training of undergraduate students. Lasers will be used to measure the properties of negative ions, which are atoms and molecules that have an extra electron. Since ions are electrically charged particles, they can be manipulated to allow precise experiments. The high-precision measurements of electron binding energies in this project will be useful for modeling of chemical reactions and plasma interactions for such practical applications as semiconductor processing, lighting and plasma displays. The detailed studies of negative ions will yield insights into dynamical many-body interactions, which is a general topic of interest for a broad range of fields in physics, chemistry, materials science, and nanotechnology. The project will enhance the research and teaching infrastructure of Denison University, an undergraduate college. Students will participate in the experiments on-campus, providing important research experiences for young scientists including technical training in electronics, computers, vacuum systems, lasers, and optics. This project studies the interactions of photons with negative ions in a series of pulsed-laser photodetachment experiments. The extra electron in a negative ion is bound predominantly by electron correlation effects and therefore negative ions provide a fertile testing ground for state-of-the-art atomic physics calculations regarding these multi-body interactions. Complex atomic negative ions are investigated on-campus at Denison University using tunable infrared laser light to detach outer-shell electrons from negative ions produced in a sputter source. The ground and upper state photodetachment thresholds of several lanthanide and Group III negative ions (Lanthanum and Thallium) will be measured in order to determine the electron affinities and energy levels. These experiments will help explain the current strong disagreement between theoretical predictions and experimental photoelectron spectroscopy results for these interesting systems. The faculty and student researchers will investigate resonances and bound excited states in lanthanide ions including bound-bound electric-dipole transitions that exist in the negative ion of La. Additional studies will investigate inner-shell photodetachment from carbon chain negative ions and two-electron photodetachment processes. The dynamic multi-electron interactions in the photoexcitation and decay of the highly correlated cores of negative ions continue to challenge the fundamental understanding of atomic structure. The series of experiments in this project will test the latest theories describing photodetachment and negative ion structure.

负离子在各种物理过程中都很重要，包括地球大气、恒星大气、放电和等离子体。这项研究计划的广泛影响包括对原子性质数据库的贡献，与其他科学领域的联系，以及对本科生的教育和培训。激光将被用来测量负离子的性质，负离子是指带有一个额外电子的原子和分子。由于离子是带电粒子，它们可以被操纵以进行精确的实验。该项目中电子结合能的高精度测量将有助于模拟化学反应和等离子体相互作用，如半导体加工、照明和等离子体显示等实际应用。负离子的详细研究将产生对动态多体相互作用的见解，这是物理，化学，材料科学和纳米技术等广泛领域感兴趣的一般主题。该项目将加强丹尼森大学这所本科学院的研究和教学基础设施。学生将参与校园实验，为年轻科学家提供重要的研究经验，包括电子、计算机、真空系统、激光和光学方面的技术培训。本课题在一系列脉冲激光光剥离实验中研究光子与负离子的相互作用。负离子中的多余电子主要由电子相关效应束缚，因此负离子为有关这些多体相互作用的最先进的原子物理计算提供了肥沃的试验场。在丹尼森大学的校园里，利用可调谐红外激光从溅射源产生的负离子中分离出外层电子，研究了复杂的原子负离子。将测量几种镧系和III族负离子（镧和铊）的基态和上态光脱离阈值，以确定电子亲和和能级。这些实验将有助于解释目前这些有趣系统的理论预测和实验光电子能谱结果之间的强烈分歧。教师和学生研究人员将研究镧系离子的共振和束缚激发态，包括La负离子中存在的束缚电偶极子跃迁。进一步的研究将探讨碳链负离子的内壳光剥离和双电子光剥离过程。在光激发和高度相关的负离子核的衰变中动态的多电子相互作用继续挑战着对原子结构的基本认识。这个项目的一系列实验将测试描述光剥离和负离子结构的最新理论。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Electron affinity of gallium and fine structure of Ga− : Experiment and theory

DOI：
10.1103/physreva.100.052512
发表时间：
2019-11
期刊：
Physical Review A
影响因子：
2.9
作者：
N. D. Gibson;C. Walter;C. Crocker;J. Wang;W. Nakayama;J. N. Yukich;E. Eliav;U. Kaldor
通讯作者：
N. D. Gibson;C. Walter;C. Crocker;J. Wang;W. Nakayama;J. N. Yukich;E. Eliav;U. Kaldor

Photodetachment spectroscopy of quasibound states of the negative ion of lanthanum

镧负离子准束缚态的光脱离光谱

DOI：
10.1103/physreva.102.042812
发表时间：
2020
期刊：
Physical Review A
影响因子：
2.9
作者：
Walter, C. W.;Gibson, N. D.;Lyman, N. B.;Wang, J.
通讯作者：
Wang, J.

Observation of an Electric Quadrupole Transition in a Negative Ion: Experiment and Theory

负离子中电四极跃迁的观察：实验与理论

DOI：
10.1103/physrevlett.126.083001
发表时间：
2021
期刊：
Physical Review Letters
影响因子：
8.6
作者：
Walter, C. W.;Spielman, S. E.;Ponce, R.;Gibson, N. D.;Yukich, J. N.;Cheung, C.;Safronova, M. S.
通讯作者：
Safronova, M. S.

Experimental and theoretical studies of excited states in Ir−

Ir 激发态的实验和理论研究

DOI：
10.1103/physreva.103.062806
发表时间：
2021
期刊：
Physical Review A
影响因子：
2.9
作者：
Kristiansson, M. K.;Schiffmann, S.;Grumer, J.;Karls, J.;de Ruette, N.;Eklund, G.;Ideböhn, V.;Gibson, N. D.;Brage, T.;Zettergren, H.
通讯作者：
Zettergren, H.

Predicting quasibound states of negative ions: La− as a test case