RUI: Valence and Inner-shell Negative Ion Spectroscopy

RUI：价态和内壳层负离子光谱

• 批准号: 0757976
• 负责人: Nevin Gibson
• 金额: $ 28.3万
• 依托单位: Denison University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2011-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0757976&HistoricalAwards=false
• 关键词: RUI; Valence; Inner; shell; Negative

This RUI project studies the interactions of photons with negative ions in two series of 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. In the first series of experiments, lanthanide negative ions will be investigated on-campus at Denison University using tunable infrared laser light to detach outer-shell electrons. Accurate measurements will be made of the electron affinities and resonance structure of the lanthanides, which are among the least well-understood atomic negative ions. The second series of experiments will investigate inner-shell photodetachment from negative ions, such as selenium and carbon-60, using ultraviolet and X-ray photons at the Advanced Light Source (ALS) synchrotron at Lawrence Berkeley National Laboratory. These experiments continue a series of studies by the PIs investigating short-lived excited states of negative ions and multi-electron decay processes.The broader impacts of the program include the education of undergraduate students and connections to other scientific fields. The project will enhance the research and teaching infrastructure of Denison University, an undergraduate college. Students will participate in the experiments both on-campus and at the ALS, providing important research experiences for young scientists including technical training in electronics, computers, lasers and optics. The detailed studies of negative ions will yield insights into dynamical many-body interaction, which is a general phenomenon of interest for a broad range of fields in physics, chemistry, and materials science.

这个RUI项目通过两个系列的实验研究了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。在第一个系列的实验中，镧系负离子将在丹尼森大学的校园内进行研究，使用可调谐红外激光分离外层电子。将对镧系元素的电子亲和力和共振结构进行精确测量，镧系元素是最不为人所知的原子负离子之一。第二个系列实验将在劳伦斯伯克利国家实验室的先进光源（ALS）同步加速器上使用紫外线和x射线光子，研究内壳与负离子（如硒和碳-60）的光分离。这些实验继续了pi对负离子短寿命激发态和多电子衰变过程的一系列研究。该项目更广泛的影响包括对本科生的教育以及与其他科学领域的联系。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。学生们将参加校内和ALS实验室的实验，为年轻科学家提供重要的研究经验，包括电子、计算机、激光和光学方面的技术培训。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，化学和材料科学中广泛领域感兴趣的一般现象。