PM: RUI: High Precision Spectroscopy for Tests of QED

PM：RUI：用于 QED 测试的高精度光谱学

• 批准号: 2110311
• 负责人: William Raven
• 金额: $ 48.18万
• 依托单位: Smith College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2110311&HistoricalAwards=false
• 关键词: PM; RUI; Precision; Spectroscopy; Tests

The aim of this project aligns well with the goal of fundamental atomic physics, which is to understand the complex interactions and inner workings of the atom. Specifically, this project tests our best theoretical model, known as the Standard Model of Particle Physics, by measuring properties of beryllium, boron, nitrogen, and oxygen. Our knowledge of atomic systems is driven by both experimental and theoretical results. The lightest elements (hydrogen, helium, lithium, and a few properties of beryllium) have been well studied both experimentally and theoretically. The proposed atoms the Williams lab is going to study are more complex and difficult to model. As the computations grow more complex, it becomes essential to provide experimental results to both check those calculations and determine which theoretical models correctly describe these multi-electron systems. This project will greatly improve upon current experimental measurements to validate the predictions of the part of the Standard Model of Particle Physics known as quantum electrodynamics, as well as provide information about the nuclear and electronic structure of the atoms. The project will also provide the atomic and nuclear physics communities with enough high precision experimental data to assist theorists in their calculations, which will then serve to drive the advancement of theory for quite a few years. In addition to this scientific impact, the Williams lab will create a course-based undergraduate research experience (CURE) whose goals are to 1) provide a robust research experience for nine undergraduate students each year and 2) train the next generation of scientists to perform high precision spectroscopy.Technical description: The Williams lab will measure the absolute transition energies as well as hyperfine coupling constants, when applicable, of a variety of states in the light atoms to provide invaluable feedback to theorists who are in the pursuit of developing high precision multi-electron models. Combined with theoretical predictions, the results will serve to test the accuracy of quantum electrodynamics. Planned spectroscopic measurements will be performed on a number of triplet states in neutral beryllium-9, two transitions in the stable isotopes of boron, and a variety of states in nitrogen and oxygen. In addition, the Williams lab will develop a novel, sensitive spectroscopic technique to measure the absolute energy of states that are weakly coupled to the ground state. This new technique, which is an extension of the well-known NICE-OHMS method, may develop into exciting future experiments including the first magneto-optical trap (MOT) of neutral oxygen and the first vapor cell krypton MOT.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目的目标与基础原子物理学的目标非常一致，即了解原子的复杂相互作用和内部运作。 具体来说，该项目通过测量铍、硼、氮和氧的性质来测试我们最好的理论模型，即粒子物理标准模型。 我们对原子系统的了解是由实验和理论结果驱动的。 最轻的元素（氢、氦、锂和铍的一些特性）已经在实验和理论上得到了很好的研究。 威廉姆斯实验室将要研究的拟议原子更加复杂且难以建模。 随着计算变得越来越复杂，提供实验结果来检查这些计算并确定哪些理论模型正确描述这些多电子系统变得至关重要。 该项目将极大地改进当前的实验测量，以验证粒子物理标准模型（称为量子电动力学）部分的预测，并提供有关原子核和电子结构的信息。该项目还将为原子和核物理界提供足够高精度的实验数据，以协助理论家进行计算，从而在相当长的时间内推动理论的进步。 除了这种科学影响之外，威廉姆斯实验室还将创建基于课程的本科生研究体验 (CURE)，其目标是 1) 每年为 9 名本科生提供丰富的研究体验，2) 培训下一代科学家执行任务高精度光谱学。技术描述：威廉姆斯实验室将测量轻原子中各种状态的绝对跃迁能量以及超精细耦合常数（如果适用），为追求高精度光谱的理论家提供宝贵的反馈多电子模型。结合理论预测，该结果将有助于检验量子电动力学的准确性。 计划对中性铍 9 中的许多三重态、硼稳定同位素中的两个跃迁以及氮和氧中的多种状态进行光谱测量。 此外，威廉姆斯实验室将开发一种新颖、灵敏的光谱技术来测量与基态弱耦合的态的绝对能量。 这项新技术是著名的 NICE-OHMS 方法的延伸，可能会发展成为令人兴奋的未来实验，包括第一个中性氧磁光陷阱 (MOT) 和第一个蒸气电池氪 MOT。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Spectroscopic study of the 4 f 7 6 s 2 8 S 7/2∘−4 f 7 ( 8 S ∘ )6 s 6 p ( 1 P ∘ ) 8 P 9/2 transition in neutral europium-151 and europium-153: absolute frequency and hyperfine structure

中性铕中 4 f 7 6 s 2 8 S 7/2→4 f 7 ( 8 S→)6 s 6 p ( 1 P→) 8 P 9/2 跃迁的光谱研究

• DOI: 10.1364/josab.467968
• 发表时间: 2022-09
• 期刊: Journal of the Optical Society of America B
• 作者: Herd, M. T.;Maruko, C.;Herzog, M. M.;Brand, A.;Cannon, G.;Duah, B.;Hollin, N.;Karani, T.;Wallace, A.;Whitmore, M.;et al
• 通讯作者: et al