MRI: Acquisition of a Frequency Quadrupled Titanium Sapphire Laser

MRI：四倍频钛蓝宝石激光器的采集

• 批准号: 1428112
• 负责人: William Raven
• 金额: $ 27.16万
• 依托单位: Smith College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1428112&HistoricalAwards=false
• 关键词: MRI; Acquisition; Frequency; Quadrupled; Titanium

Non-technical description:This grant supports the acquisition of a laser system at Smith College, an undergraduate women's liberal arts college. This system will enable two main developments, the first of which is the next generation of a technique called "Atom Trap Trace Analysis (ATTA)" which is expected to significantly improve the ability of the U.S. to monitor activity at known and suspected nuclear reprocessing sites, as well as to analyze ice core samples for climate history studies. The second development involves the measurement of several energy levels of neutral beryllium to high precision, which improves our understanding of atomic theory and helps to advance basic science. Technical description:To perform trace analysis with krypton (in support of the first development described in the paragraph above), krypton atoms first need to be transferred to a metastable state for laser cooling and trapping. The precision of most Atom Trap Trace Analysis measurements is currently limited by the methods used to produce the metastable atomic beams. Replacing these methods with the optical source funded here will lead to significant advances such as an increase in detection efficiency, a decrease in sample size, and elimination of cross-sample contamination. The beryllium project (the second development described in the paragraph above) aims to improve experimental measurements on several energy levels and the ionization threshold. Currently, theoretical estimates of the energy levels have more than an order of magnitude more precision than experimental measurements. These improved experimental results will delineate various theoretical models, test quantum electrodynamics, and help determine the nuclear charge radius of beryllium.

非技术描述：这笔赠款支持史密斯学院（一所本科女子文理学院）购买激光系统。 该系统将实现两项主要发展，第一个是下一代“原子陷阱痕量分析（ATTA）”技术，预计将显着提高美国监测已知和可疑核后处理场所活动的能力，以及分析冰芯样本以进行气候历史研究。 第二个进展涉及对中性铍的多个能级进行高精度测量，这提高了我们对原子理论的理解并有助于推进基础科学。技术描述：为了用氪进行痕量分析（支持上段中描述的第一个开发），氪原子首先需要转移到亚稳态以进行激光冷却和捕获。 大多数原子陷阱痕量分析测量的精度目前受到用于产生亚稳态原子束的方法的限制。 用这里资助的光源取代这些方法将带来显着的进步，例如检测效率的提高、样本量的减少以及样本交叉污染的消除。 铍项目（上段中描述的第二个开发）旨在改进几个能级和电离阈值的实验测量。 目前，能级的理论估计比实验测量的精度高一个数量级以上。 这些改进的实验结果将描绘各种理论模型，测试量子电动力学，并帮助确定铍的核电荷半径。